I found this web site a while ago, it gives plans as digital download loads.
https://genone-luthier-supply.com/products/4-string-acoustic-bass-guitar-plans
Some people call me a tool, others are less complimentary. Tools being useful things.
Hi @rocknroller
Thanks for the link. This company used to trade as Georgia Luthier and the first two guitars I built were from their Grand Symphony plans. I was very impressed by the amount of information supplied, certainly compared with some other plans I've bought since, so I will probably download the one for the acoustic bass and have a good read.
Cheers
Darren