i am giving myself an extra rule which i call "HARD MODE" that mandates: the tools used to fabricate custom parts must be included in the $100.
why hard mode? because anyone with a mill can impress.
this is a poo polishing contest with a $100 spending limit, the spirit is lost if i can just get a $2000 cnc to mill a $10 raw metal into a brand new flowery custom part. a true poo polisher would only replace poo with poo, not abandon half the poo for flowers.
and so, i opt for my hard mode, because i have a hard on for poo. we are doing this not because it is easy, but because it is HARD.