So, I started testing the process to align the laser..  I need to add a couple screw holes in the mirror mount and a place for the spring/grommet I use to hold it..  But I think the test came out pretty successful..  As it was pointed out, it does seem to make sense to put a coating on the inside to limit the stray light and reflections inside the beam tubes.. Here's a quick video showing the laser running in the assembly...  

My next step is to get the beam splitter in there, with the adjustment screws in place for the mirror and see if I can get a solid beam out the objective lens and centered through the beam port to the filters...  I am sure I'll have to place some adjustment screws on the mount for the beam splitter too....baby steps.. :)