Yes, apologies for missing out the sheet size. It would be nice to work with bigger sheets - the PTFE tyically comes in 1200x1200 sizes.

But I'd need to go for a vertical one like JazzCNC's machine as space is quite tight at the unit.

So the conventional 600x400 - 1000x450 seem about as big as I can fit into the space available, and I can get the materials pre-cut to fit on the bed.