Marty, thanks for the kind words. It only exists on screen so far. I did have to borrow some of my girlfriend's son's pieces to validate the landing gear geometry. You can't lower the gear in LDD because it can't handle the two additional pivot points of the 45 deg. bracing strut. Likewise I had to remove the connecting rod from the thrusters to simulate their left-right motion. i too find DbM a bit spendy. I estimate the FB-X2 at about 400 pieces. At $237 that's 60-cents a piece. I wish they'd just let you export the parts list in a format you could send to a store. Or better yet, let vendors bid on supplying the parts just like the , er, big boys do it.
Great to hear that a more 'mature' person also enjoys playng with the stuff, but my wife laughed her head off when she read about "swooping, curvaceous, voluptuous forms", wondering about what type of Lego you were playing with!!! I want a set of that!!!
I previously used to think that the only good construction was that suggested by the instructions and I never deviated from them. I realise now that I was missing out on something having built my "Firefox". I will not, however, ever build anything like it again as (i) it was costly ordering all the parts from Bricklink.com and (ii) I too spent many a late night trying to overcome a modelling problem, attempting to get a form that approximated the blueprints. Such obsessions are not healthy!
Good job, by the way, and happy building!