Nice build there

I'm a good way through building a 12 combiner right now. It's just a shame that DVD burners don't run at <640nm. It seems to me (to my eyes at least) that even 10W of 660 wouldn't look that bright (for beams), so I'm opting for 800mW of 637 along with the 660; wavelength seems to be the massive over ruling factor here.