I actually sent my TE to Turbokon to be modded, but when it gets sent back to me I could do a vacuum form of the cover and either pour resin into the mold and have a solid resin piece or just fiberglass it.
I make power ranger helmets using this technique so Ill bet I could get a fairly accurate result doing this. And if I fiberglass it I can always sand/putty it till its perfect.