I can confirm this; I also remember that it's lexan.
It was mentioned on the original website which also stated that the lexan is clear and the layout is printed on the underside
to make you you won't ever be able to rub it off during use.
The sample Digitouch I received came disassembled and included one Qwerty layout and one Dvorak, so I have one left over. It's _very_ thin, perhaps 0,5 mm,
and almost as flexible as an old-skool 5.25" floppy disk. The finger-alignment dimples are actually dents made by pushing into it from the underside.If you want to make your own,
you can use any material you want as long as:
- it's electrically non-conducive,
- it's reasonably thin (1mm could probably work too without getting weak readings of your gestures,
- it's tough enough to withstand moisture (ambient air, moist fingers),
- it's reasonably scratch-proof,
- it's reasonably slippery (for easy gesturing),
- it should probably be transparent so you can print the layout on the underside.
I've experimented with printing custom layouts on thick paper (card stock) and the overall experience is that the print wears off quickly, the paper absorbs too much moisture (and becomes dirty), and the very thin layer of air between the paper and the original surface interferes with gestures. The last point proves that thinness is important; the other points indicate that you need something sturdy.
Good luck! Let us know what you're up to.