Two Blue Laser Diode Beam Combiner

I am working on a two Blue Laser Diode beam combiner. It will be made of 6061 T6 Aluminum. This will use two Laser host modules with lens to hold the Diodes (top and front facing bored 12mm holes). Another partial module will be drilled out and used to hold the output lens at the bottom 12mm bored hole. These bores must be on the same plane and the same axis. The Diode lenses will be focused to infinity into the combining cube. Those cubes are wavelength specific and are 12.7mm square. that goes