This is the door as it comes from StreetBeast. The latch mounting holes are predrilled. An access hole has been cut and part of the hole for the latch release has been cut.
First I marked the area to be cut out where the striker will enter the latch.
My favorite tool for cutting the fiberglass is this air powered saw.
After cutting the area out for the striker I used a Dremel tool to smooth and finish the hole. Notice the notch on the left side of the cut out, this is for the latch catch. The latch mounting holes had to be drilled out to 1/4 inch. The hole on the far left had to be drilled to 5/16 inch for better alignment.
Next I marked and cutout the hole for the latch handle.
Notice the slot for the spring to slide through.
Then I measured and cut the wire that connects the handle to the latch.
After attaching the completed assembly of the handle and latch, I slid it through the hole for the handle.
Then using 1/4 - 20 x 1 1/4 bolts and washers, I mounted the latch.
Then using #10 x 5/8 self tapping pan head screws I mounted the latch release handle.