Thanks for the input, Arek! Indeed, the hoods will have the OEM-like flanges along the left and right sides. Also, a stiffener pattern will be used, with the core material being a special polyester 'volumizer' designed just for the job.
I wasn't aware that the e46 hinges would be preferable. I haven't finalized how I'm going to interface with the rear hinges yet, so I'm sure we can make it work with the e46 ones. The front will be hood-pin only; no support for the OEM latching mechanism.