I'm actually trying to duplicate the studio model as close as possible, so everything I put on there is something I saw in the pics of the original. I spent hundreds of hours going over the studio model pics, identifying kit parts, then buying them on ebay, sometimes an $80 kit will only have 1 part in it that I need. And since the original was made in the late 70's a lot of those kits that were used aren't in production anymore, so they're collector items, I've had to tear the plastic off of rare, mint condition model kits just to scavenge it for parts, it's kind of a shame, but in the end it's worth it to me.
It's a very tedious process.