Did you check with SnugTop or a distributor directley?
A fiberglass shell shouldn't be more than $500-1000 maybe more with the features listed below?
http://www.snugtop.com/products/HummerH3.php
Featuring a classic low-profile and contoured design, the H3T?s SNUGLid tonneau cover keeps cargo in place and protects it from weather and theft while its tailgate-overlap provides extra security. Reminiscent of the original HUMVEE, but with a classier look, the precision-crafted SNUGTOP Slant Back Cover appears as a natural extension of the cab while providing extra storage for all manner of outdoor gear and gadgets.
The Slant Back cover offers these features:
- FIXED FRONT WINDOW
- PROLOCK BACK DOOR LOCK
- STANDARD RACK TRACKS (for use with Hummer accessory racks)
- SNUGRUG HEADLINER (coal mist only)
- INTEGRATED 3RD BRAKE LIGHT
- "LIFT ASSIST" PROPS (Cap and SL Lid)
- KEYLESS REMOTE (SL Lid only)
- DARK TINTED GLASS WINDOWS
- OEM COLOR MATCHED PAINT