1. Everything on a Go-Torch /P--CAM is proprietary. Their controller runs with their software. You cannot run anybody else’s control software on their controller. I don't know if SheetCAM has a Go-torch POST or if the Go-torch will even run G-Code from an external program.
2. I suggest you join the CandCNC support Forum (open to anyone interested in CNC , especially plasma cutting) and get feedback from some of the thousands of members about building your own plasma table.
TOMcaudle
www.Candcnc.com
Home of CommandCNC(tm) for LINUX