Hi wavedinamic & welcome

There was a member on here building a foam-routing machine to do part car-body full-size models. I would have thought his cutting area was bigger than you would need and the foam is probably a similar density stuff. As I recall this was his second machine to do the job, bigger than the first; he worked for a firm that protoypes specialist car bodies.

Can't find it at the moment but I'm sure some time spent with the search tool will find the thread.