We have started rounding stuff up.
An old line shaft here, corn picker frame tube there, 30# (1 3/4") bolt, some leaf springs from an old pickup, a 3/4 hp motor, a good old tire, etc.
Still need to figure the base better, make some hammer plates, & build a 3/4" id, 3" od flat pulley to drive.
In the end, it will be a derivation of this.
Only with more "******* Inventivness"