Upgrading a 40w ZJchao w/ USB / LaserDRW

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I purchased a 40 watt laser off eBay that I am in the process of upgrading with the Lightobject upgraded parts. The manufacture is ZJchao and the power supply and control board are different from any laser that I have found in any of the discussions on this board.
Does anyone have a schematic for this laser?

The connection to my pc is a USB port running LaserDRW and WinsealXP instead of MoshiDraw. The laser was damaged in shipping due to all the accessories piled on top of the cutting table. Without all the help from all the info posted on the boards here, I would have never been able to get it back into alignment.
So far I have replaced the laser head with the Lightobject 18~20mm Laser head w/ air assisted and removed the table and replaced it with the 300X200 Honeycomb. I found a A-214B2 Karter Scientific Stainless Steel Lab Jack that I use to raise and lower the Z axes to focus the work.

My laser came with a very small 12 mm 50.8 focus lens.
What is the best replacement for the lens? The 18mm GaAs or the 18mm ZnSe? I am now using the Lightobject18~20mm Laser head w/ air assist.
What is the difference between the High Quality and the improved 18mm ZnSe?

There is now a Facebook group on upgrading and using these lasers.

Laser Engraving and Cutting https://www.facebook.com/groups/441613082637047/