x700 redsail laser cutter

Hi I am a new kid on the block, I have a redsail x700 cutter on the way and hopefully everything will come together without to many problems. I ordered an extra co2 tube and an extra set of mirrors and lenses, my question is this if both laser tubes are centered on the first mirror with some modifications to the cabinet what power would arrive at the cutting end. Could this be done it would be great to be able to use the single 50 watt tube for normal work and be able to fire up both when more power is required. If two 50 watt tubes are set perfectly on the same spot on the first mirror would the power be 100 watts or would there be some loss. Any ideas on doing this out there! just an idea. I also run a small cnc router 600 x 400 works great I would also like to configure this laser cutter to autocad and mach3 software witch I am very comfortable and familiar with ?
Kind regards Mannetjie South Africa

The problem is how you put two tubes on the x700 and adjust the mirror.
When the laser arrives you can measure acrylic block and give me ??
regards
Roque7

Hi Roque7 What about 2 lasers, 2 sets of mirrors directed to the lens would that not work? I still need to know about rigging up Autocad and Mack3 are there any ideas in the laser community about doing that would be good for me Regards Mannetjie