Hey bud, it's quite simple, I have a working shuttle , it can reach orbit with 3k deltaV spare and has an easily modifyable fuselage length I edited 1 value to allow the ssme's to more accurately reflect the vectoring from the real shuttles. If you would like I'll be more than happy to make a vid of sts1 to demonstrate its basic functions and then follow by release of the model Lemme know if your interested