Water jet sheet foam cutting

I use a material called depron for making model aircraft. It is
similar but not quite the same as meat tray foam or burger box foam.

A friend mentioned that it might be possible to water jet cut it and
it struck me that this might be one application that water jet
cutting could be applied to in the home workshop.

I'm sure it wouldn't take all that much pressure to cut through 2,3
and 6mm sheet and the jet might be made quite small.

I was just wondering what people thought of the concept and what
would be required as far as a pump goes. Also what kind of nozzle
keeps the water firing in a nice narrow jet and perhaps more to the
point how do you protect your rails etc from all that water.

I'm guessing a belt drive system would make sense because of the low
cutting forces (X and Y at least) and the fact that belts don't rust.

Thoughts?

Graham