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for the frame you can use wood (MDF), but you need to think in 3d as the fiberglass cloth will stretch over it it, thats how you get those sexy curves.
it is VERY forgiving....you really just need the fiberglass as a good base shape and for something to hold the bondo...you can really fine tune it all with bondo.
also it is sometime easier to fiberglass the whole thing as one big piece (like use a big cloth to cover the whole screen frame and where the screen would be)...the weight of the cloth helps keeps things stable so you can set it just how you want....then it is like butter to cut the cured fiberglass screen area out.
Try looking on eBay