Chris here…
First of all, congratulations Mark on establishing such an excellent contact, this is brilliant for everyone concerned IMO! 
In terms of how to utilise an interview with Stephen - I’ll be honest and say that I would very much like to have a (text-based) interview with him in the Cartoon Section, specifically in here: http://www.thundercatslair.org/cartoon/about/articles/index.html . However, I’d be happy to type out a transcript of an audio conversation if that’s the way things went!
One thought that did occur to me was, if it was timed cleverly, an audio interview for ThunderCast and a text-based interview for this site could be combined - maybe an audio interview could be done with Stephen for “broadcast” on ThunderCast, with a text-based transcript hosted in the Cartoon Section? Or, we could ask Stephen if he would take part in the text-based interview, and do a shorter, more “bite-sized” interview for inclusion in ThunderCast, released to promote the longer interview published at the same time on our site. So, in this way there could be a lot of “cross-promotion” between the two things, the site and the podcast - what do you guys think?!
In terms of questions - these are what I personally would ask him:
[FONT=Arial][FONT=Verdana]When did you start writing and how did you get into doing it professionally? Did your writing career start by writing for television? [/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]How did you become involved with writing for animation? [/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]How did you become involved with ThunderCats? What was the first assignment you were given for the show? [/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]Are you able to give us any insight into how scripts came to be approved for ThunderCats? Who did you need to submit them to, was there a special process you needed to go through, and did you have to be on Lorimar-Telepictures’ “payroll” to submit a script or did they accept unsolicited scripts? [/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]Did you ever get a chance to interact with any of the other creative team on ThunderCats? Was there a lot of interaction between the show’s different writers or did you all work completely separately? [/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]On the same note, did you ever get chance to interact with any of the other people who worked on the show such as the animators, directors, voice actors, etc.? Once you completed a script, how much control did you have over the final product (i.e., the finished episode)? [/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]A couple of your episodes, specifically “Safari Joe” and the “Feliner” 2-parter, were actually noteworthy for introducing creations tied in with the toyline – those being, of course, the character of Safari Joe who was released by LJN as an action figure, and the Feliner vehicle which was planned to be released as a toy but never made it to production. Were these all your creations, or were they developed by the toy company and then assigned to you to write into the series? [/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]The two “Feliner” episodes also introduce Snarf’s young nephew, Snarfer, to the series. Snarfer would go on to play a big role in season 2 – was he your creation, or again was he a character that you were given to work with?[/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]You were the writer on a total of seven episodes of ThunderCats – did you write any more scripts that, for whatever reason, never made it to production? If so, can you remember any specific details? [/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]Was there a ThunderCats character that you particularly enjoyed writing for? Which group of characters did you find the most fun to write for, the heroes or the villains?[/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]How would you describe the experience of working on ThunderCats? What would be your best and worst memories?[/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]Looking at the episodes you wrote, they all appear during ThunderCats’ first season – is there a reason why you didn’t return to work on the second season of the show? [/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]Are you still in touch with any of the other creative team who worked on ThunderCats?[/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]After finishing your work on ThunderCats, did you do any more work for Rankin-Bass? [/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]Do you still write professionally, and if so do you still write for animation? And, if so, does this include scripts for any more TV series? [/FONT][/FONT]
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[FONT=Arial][FONT=Verdana]Have you ever done any writing for comic books or other sci-fi/fantasy mediums aside from TV or animation? [/FONT][/FONT]
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[FONT=Arial][FONT=Verdana][SIZE=2]What have you been working on recently? Have you got any upcoming projects that we should keep an eye out for?[/SIZE][/FONT][/FONT]
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[FONT=Arial][FONT=Verdana][SIZE=2]Again, well done for scoring this one, Mark - absolutely brilliant! :)[/SIZE][/FONT][/FONT]
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[FONT=Arial][FONT=Verdana][SIZE=2]Take care… :)[/SIZE][/FONT][/FONT]
However, what I always try to do with an interview is try and get whoever I’m interviewing to talk about things that may be of interest to those who are likely to read it - for example, I know Steve has a background in comic books as well (as indeed did a large proportion of the writers on ThunderCats), so that’s something that’s of general interest - you get the idea!