Crypto, the chin portion should be included in the regular cowl file. Print that and it should all fit.
In other news, I'll be using a smooth-on product (EpoxAmite 100) to do the laminating of the cowl portion. I now kinda fear using a heat gun on the chin portion because I've heard that fiberglass resin doesn't really take well to extreme heat. I'm still gonna try, the worst that can happen is a do-over for the chin. But I'm thinkin the smooth-on product will do better with heat than traditional fiber-glass resin. Any thoughts?