It would be great if you did document it. At least a few pics/details of the custom hard parts. Also, if you'd make 2 sets or have specific details of them I'd buy a set off you, even just the cut material and I can weld it together.
I like the DBW idea. keep it simple!
I did not know spec made a flywheel for an LS4 with an f40. I think the f40 flywheel is thicker than what is needed for the F23/getrag, so if they make one for the f40 they should be able to make one work with the getrag. To note westcoastfiero has a LS4 flywheel on their website, $440. but I'm not sure how long that will take (many Fiero guys say it takes forever!)
I see Spec makes push to pull conversions. I wonder if they'd make anything for the 284?