Using Bamboo for Practice

The medium used to write has a huge influence on the shape of
letters in a script. So in developing a conscript, has anyone
actually used the material the script is/was written on/with?

I have!!

I developed the Boreanesian script by trying to copy the ancient
Indonesian Kavi script on bamboo with a knife. The resulting
deformations became the Boreanesian script. The combination of a
sharp cutting instrument and the long fibers of the writing material
influenced the shapes of these letters to a great extent. Letters
tend to be angular with thick horizontal lines, thin vertical lines,
and short curved strokes. It looks very much like a cross between
the Buginese/Macassarese script of Sulawesi with Buhid script of a
Mangyan tribe in Mindoro Island, Philippines.

Anyone else?

Regards,
-Kristian- 8-)