High cost and long lead times - custom builds are ripe for disappointment.
There's been a few here recently - faultless bass arrives and it’s just not what you’d hoped for. It’s an expensive lesson.
Years back had a custom build from US - specced woods but naively left selecting exact pieces to the luthier, he’d done other basses in this wood and I’d ‘assumed’ would look the same. My fault, and my money. Hoped I'd warm to it but sold within a year for half what I’d paid.
What’s the one piece of advice you’d give anyone embarking on a custom build?