On further inspection of your picture, it looks like a pipe I bought from China, made of some type of synthetic material with an insert for the firepit. Does your battery live in the bowl or are you using a small diameter battery in the stem? What battery does it use?
I have had no time to work on my pipe for months, too busy working on other stuff. I do remember that the material it was made of was really hard to drill for the touch pad, the material itself is some type of black carbon material.
My pipe in progress showing touch switch
The carto installed
The stem installed over the carto
Note the inside of the bowl is black colored .. that is the material the pipe is made of.
Still haven't solved the MOSFET and battery problem, this will definitely be my 'to-go' vape when I go for a weekend away from home. Looks cool and it will vape nicely when finished (if I ever do get it finished) LOL