Adding A Laser to My Shark HD5: Need Suggestions

I have a (New Wave) Shark HD5 that I like. I want to add a Laser Module. I think that CO2 is the best type. I also think that 40 or 50 Watts would be the minimum to nicely cut 5 to 10 mm plywood. That is the immediate plan and I want to know what modules are available to can be fitted to my HD5?

I also hear that thin glass (think 5mm colored glass such as used in leaded/stained glass) can be cut and that CO2 lasers are a good type. What I am very unclear on is the power level I would need for this use. That, in turn, begs the question of whether it would make sense to 'over-size' the CO2 laser module now to a power that would be adequate to cut stained glass as well or if I really should deal with that separately down the road? Sources, suggestions, alternatives all welcome. Thanks.