please make sure you search the forums about polarization. one laser has to be vertically polarised and the other horizontally if you just use a pbs (or else you loose half the power). or you can use a waveplate and keep the same polarization
2 part epoxy will do the gluing part, not sure about the removal part though. don't use instant glue, crazy glue etc etc
the dichro filter order depends on the type of filters you have in hand, in mine i go red, then green, then blue, as i have rflect green and reflect blue dichros. other people prefer to have the red as close to the galvos as possible
"its called character briggs..."