One of the nice tricks if you are unfamiliar. Let the fabric run past the edge that will be the finished product and cut it with a razor knife when the epoxy is past runny but still not dry. If you have a core and cover it with fiberglass that it the easiest. You can sand it and add layers of fiberglass and epoxy to corners and such. The blue insulating foam makes a good core. Think custom surfboard in the shape you need. Check into local hobby stores for smaller applications.
Sanding and working with fiberglass/ epoxy, especially in a small area use a respirator.
98 uzj100. Factory rear-ARB front locked 4.88's. ARB Bull, Warn 9000, Irbis rear bumper, Slee sliders and belly pan. OME t-bars w/863 rears, HID, XM