Well I've downloaded AutoCAD LT 30 day trial.
Basically I bought AutoCAD files which have the patterns for watercutting TA22/23 and RA28 dashboards from sheet steel etc. All the plans are in one big file so I was looking at creating each one on it's own.
IE StephenG wanted a change made to his TA22 set, so I cut that pattern from the main file, pasted it to a new file and then removed the cuts he didn't want any more.
I do need to change the pattern for the RA28 to have a single DIN slot for the radio as well as the original AC + rear screen heater buttons. That's a little more fiddly so might take me a little longer.
Hopefully cutting from the original .DXF file and then saving my edited versions in AutoCAD LT will be ok and not screw up the patterns.