Hi Shorty, fellow noob Canadian here.
I good place to start some research on your venture would be the
photonlexicon.com forums. It's a great source of all sorts of laser projector information.
When mixing colors to make white many things need to be considered. Not only the power (mW) of the lasers but also their wavelength (nM), beam diameter and divergence, optical loss and other technical stuff like
rayleigh scattering. A program like Chroma which can be found on the PL forum will get you started in the right direction but for best results more calculation and visual adjustment is needed.
Here's a Chroma example.
So, if the red is left as is at 100 mW it looks like a 150 mW bluray turned down to 130 mW and your green turned down to 30 mW would make for a nice white. At these power levels, as long as your not directly scanning the audience or highly reflective materials (disco ball), I think you should be fine for eye safety.
One option might be to buy a cheap RGV Chinese unit. I don't own one but I have been reading about the
PF-114 in
THIS thread and a few others. From the pics it looks to be a pretty decent little scanner for the $250 you pay if you buy direct from the manufacture. I'm not sure if it would be compatible with the software you were planning on using but I'm sure you could redesign and upgrade/downgrade as needed.
Borg, I know you were, at one time, looking at this projector. What are your thoughts on it? I don't think you could build it for less and it looks like a good platform for upgrades.