Pretty cool Woltz.
I had a look at some of their OD's (I'm a dirt pedal junkie).
I'd be interested what your cost comes out to with parts & enclosure.
If I get bored, I may price out one of their overdrives and see what it totals.

I've done some pedal mods, but never a full build. Though I've thought about it more than once. You've kind of piqued my interest again. (but I do have two guitars going atm )
Cheers