I haven't been here long but I haven't run across any CAD drawings of full cabs. I have seen a lot of sketchup, and a few drawings of discrete parts. if there is a particular type of cab you like taito, dynamo you could search for that. if you can find a vector file you may be able to open it with/import into AutoDesk design review, or whatever they call their free viewer right now, and save as *.dwg. good luck. Sketchup will export to dwg, but you may need the pro $ version.