join the night vision forum neil and there is loads of builds on it . Jax13 has built a few so you could ask him.

It all depends on what you want to use it for . There is add on ones that use a small camera on the end of the scope and a monitor to ones that have been built into and old scope with a tiny screen that you use like a scope and not like the monitor type.

Sure 24 has a few starter parts like this https://www.sure24.co.uk/solutions/night-vision

there was a guy on Eblag doing 3d printed camera housings to use instead of the Nite-tek ones. I can't see them on there just now. i bought one but its at my mates house .