I actually just built a delay pedal from scratch a few months ago with my dads help. we got a copper plate, printed the circuit board layout on it using an iron and the printed design on glossy magazine paper. we got the design for the circuit board for the delay pedal online somewhere. we figured out all the parts we'd need and ordered all of em and finished the circuit board and we soldered everything on and drilled holes in this metal box we ordered and stuck it all in there and BAM it works and its totally awesome.
ill upload pics of all of it later.

it was really fun and now ive got a delay pedal and the parts and everything only cost me about $40 -45ish when it was all done.