Not at all, Anselm.
I'm just trying to find some real instrument as the other ones here and I've read this topic making my intervention.
For several years I tried to find something to build. Some kit, some valid project.
In internet I found several of them but also several "craps" that, for one...
Look, I'm interested to laser harps as well, and I discovered this brand.
The laser harps are with two colors and one model can drive ILDA projectors. I think it can have all the colors.
Please, have a look
Poly-Color Laser Harp
the laser harps are really rugged.
Perhaps you can ask more...