This enclosure (based on Alley Cat's TD1) adds an area for a thermal cam to the top of the T-Deck. Specifically, it adds an area for the Adafruit MLX 90640 thermal camera.

The camera does sit directly above the GPS antenna, but it doesn't seem to interfere with the signal to any significant degree, from what I can tell.

The video below shows me assembling a T-Deck with thermal cam, gps, and realtime clock, and this case.