We have a custom made CNC mill / plasma cutter, model number DG-1335, made by manufacturers in Shenzhen. They have done a great job in making this machine for us.
The maximum dimensions of the machine are 2400mm x 1200mm. The controller is a WeiHong NK105 G3. We have found that model preparation is best done in Autodesk Fusion 360 which can be downloaded HERE.
You can find resources for the machine HERE, and the machine zero (MCS) is at:
X: -492.918
Y: -570.864
Z: -7.203
(the z value is for the current bit setup and will change when you change the bit).
You can prepare your mesh file using the following tutorial: