I think this is a really bad idea for two reasons:
1)Absolutely NOTHING in the Trendmasters Jupiter is useable. Nothing. You's have to build everything from scratch. And when I say everything, I mean EVERYTHING including a new floor and new walls (The floors have big protrusions molded in to provide clearance for the retractable landing gear and the walls are molded in a continuous curve rather than flat sections).
2)The Trendmasters Jupiter 2 is relatively rare and quite collectible. MIB examples can sell for a couple of hundred dollars or more. Complete open ones can sell for near a hundred dollars. Obviously, trying to make it "accurate" destroys any value.
There's no good reason start with a valuable, collectible toy and gut it to make a "model" when there are already better models available. Converting toys is a reasonable option when there are no better alternatives. In this case, there are better alternatives.