Another issue to plan is where and how to physically mount the Trig transponder and GPS bricks. Using a long cable to connect the transponder brick to the panel unit gives you more flexibility on where to place the bricks. I mounted my two bricks on a vertical piece of plywood behind my headrest. I fabricated a perforated metal cover to insure air circulation around the bricks even if my 'survival bag' on the turtle deck is pressing against the perforated cover.

There's no carbon fiber in my glider. The GPS antenna is velcro-ed inside the fuselage above the turtle deck. The transponder antenna is inside the fuselage about four feet behind the bricks in the boom (as far away as possible from my head and metal parts). I made a special tool to reach back into the fuselage. Mounting the transponder antenna was by far the hardest part of the installation task. Powerflarm antennas are in the nose in front of the panel, so I have about five feet between my two GPS antennas.

I recommend giving yourself a lot of time to sort out where and how to mount the physical pieces. The wiring is trivially easy if you buy a custom made wiring harness.