About the choice of cameras, I found out that for most usage, like small objects or places scanning, it is better to go wide angle, you will have more overlap to work with. 50mm on a full frame or even wost on a crop sensor is too long in my opinion.
I have been using 16-35 mm zooms and 24 or 28mm primes on full frames cameras (EOS 5DSR and sony A7RII) and 10-18mm zoom and 12 mm primes on crop sensor camera (Sony NEX6).
If you are doing handheld indoor shootings, watch the high iso settings performances of the camera, this is very important.