From my experience, a green laser is better as a red one, especially if you don't want to work in a very dark room. It's more expensive, too. (That's the reason I still use my €14 red "builder's shop" line laser. I did not want to spend a lot of money for the whole thing.

If a litte bit of money isn't an issue, you could do two scans at the same time, from different directions. You would need a red and a green laser at the same time, and scan from different angles.  You would need two webcams and either a really fast computer with lots of RAM, or two computers. 

There is a setup with which you don't neet the angled walls to be behind the model. You can have the angled walls directly in front of the laser, with an removable corner, and scan through that opening. I haven't tried that, but a lot of people in the David forum did, so it seems to work.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.