The drawing is offset a bit - Just down to more accurate tweaking of numbers in the driver software.
Drawing drops out at top and bottom - I think this is down to steel strips behind the back light tubes easy enough to fix.
Pressure sensitivity works sometimes - This stack is squishy because of gaps under the plastic frame, so the pressure varies quite a lot, again this should be fixable.
Biggest problem, drawing drops out occasionally - I believe this is a combination of the flexibility of the stack and the thickness of the backlight. This needs a bit more investigation before I can make any decisions.
A3 size 2mm acrylic sheet £6.45. Cost so far £75.09