Hello, haven't been around for a while but still building cabs.   Been doing it for 17 years now. I build cabs with fresh out of long term lock upped youth in a bad area of a bad city. We give the cabs away after a year or so and a new group of students build a new cab. Its all about bonding really.
Anyway there are two things I hate and that's cutting the side panels and cutting t-molding slots. I got a CNC shop that will do it cheap because its for a school,  if I give them a CAD file.  Never done that before but I do teach algebra so I think I could figure it out.
Any free software out there. I have been messing with LibreCAD.  I have a cab in storage with all the measurements so that's taken care of