Hi Sam,
Welcome to the forum.
This is the only YB-4 bass diary I know of - https://www.buildyourownguitar.com.a...ead.php?t=2112
Bass Guy has done some very nice basses - his threads have some of his handiwork over the years - https://www.buildyourownguitar.com.a...earchid=900006

All the best
Colin