Ok, I know its been months and the airbox was on the back burner BUT I've still been mulling it in my mind. One of the big issues I'm having making this in my garage is the attaching hardware for the two pieces. I've thought of several ideas; threaded post with a wingnut, plain jane nut and bolt, screws, latch, spring clips, dzus fasteners, etc. I think one of the easiest to make/use to separate the halves would be hooks and high grade/industrial rubber bands.

more pics in the albumn
The issue is it looks a bit tacky (not for me really but others maybe). Its a rough photo to get the idea where the clips would be. One would then stretch the bands accros the intake side to attach on the opposite side of the engine piece of the airbox. Confused?
Anyhow, I'm up for ideas on attachment hardware as I'm working the remaining bondo/smoothing of the mold. I have all the materials to attempt the prototype soon.
Funny thing is I put FCRs on the D12 and don't have the airbox anymore!