People plan things out? I did not know that was a thing. I usually think of one element and work up from there. 
I mean, my shuttle was "planned" with "cargo bay needs to be this big; total footprint should be inside these bounds" and that was it.
Also, I'm now facing some wonkiness as I mount the wings and roof because one sidewall pulled skew somehow as I glued it up, so... yay, working around the vagaries of measurements and flexible materials, I guess?
Lost Egg, the newly restarted shuttle looks great! Are you going to just go for solid painted windows and rear door to keep things structurally sound and straightforward?