For char reduction, I had to change my pulses per inch from 400 (where I normally cut) down to 100. This gives 1/4 of the pulse burns normally used, but since there is more time between each pulse, they laser pulses are hotter so burn through deeper. It still had a lot of charring on my cuts too, but still quite usable. I used a 1.5" focus lens (engraving lens) because I don't think I have enough power for my 2" cutting lens to cut all the way through. I too was surprised I could find the wood on Amazon, but B/BB grade was there for $2.65 a square foot delivered to my door, and having it available in a size that fits my laser was a bonus. So I sanded the module with 40 then 220, and sealed it with Spar varnish so it will stay stable. This module was made from 6mm Baltic Birch plywood, laser cut to the specs of a single wide module 220mm wide, 270mm deep (including the skyboard) and 70mm high (178mm including skyboard). I cut .165" holes just above the leg levelers so I could drop an allen wrench down to adjust the height. Something I did different in my 15 minutes of design work, is since the specs require a skyboard on all straight modules, I just incorporated the skyboard as part of the module to save both setup time, wood and weight. I don't have the measurements for the electrical panels, so I didn't cut any mounting holes yet. This is just a test case module. Underneath is 6mm threaded inserts, threaded for 1/4-20 threads. I used 2 inch long 1/4-20 set screws, and have 5mm ID rubber caps on order to make them soft feet. The good thing about having a permanent skyboard is when I set the module on it's side for access underneath, the skyboard prevents the module from tipping over. What do you guys think?