Here are some photos of mine, made from L-angle. Fore-aft length is 1.5 inches, the slanted vertical piece is sized so that the hole for the positioner lines up with the existing tooling hole in the bulkhead (which I enlarged slightly). The positioner is a mushroom head screw originally intended for furniture assembly, available at any HW store. If I was to do it over, I'd install a nut plate on the back of the bracket and use a AN-3 bolt with a polished head. Once you're in position, you only need to a few 32nd's of adjustment range.
I found that my canopy was pushed forward by 3/32 - 1/8 of an inch when the gas struts were installed. These babies easily held everything in alignment.
Highly recommended!