I printed out my preliminary design for the front part of the rangefinder housing and fitted some of the electronics. There were issues.

That is a Pi Noir camera board and three super cheap 5V red dot laser diodes

They looked okay, but when the lasers came on, it was a different story. I designed it so that the diodes fit tightly. I figured, 'If the receptacle in the 3D model is straight, the lasers should shoot straight, right?' Nope. They were all over the place, probably due to manufacturing (in)tolerances. So I need to redesign with a way for the lasers to be aimed.

Here is a rough idea of how the rest of the housing works...

This housing can be mounted on a pan/tilt mount powered by the battery contained within, making the whole unit stand-alone.