After some computer issues, I can get going on the learning side of things again.
I found Autodesk Fusion 360 (thanks again to the info here) which integrates CAD and CAM so have started using it. I'm brand new to Macs so am still learning the in's and out's of screen shots etc.
I won't be having the foam cutter anything other than flat as it wouldn't be possible to keep the foam block and the cut part in the correct position at the end of the cuts and would cause damage to the parts. With the block flat, I can use double-sided tape and gravity.

Better keep drawing, hopefully have some info and pics for you soon.
Clayt