You'll cut the sides based on the centreline, rather than work out the centreline based on the sides (if you get my meaning!). Work out the rough middle of the board at both ends, and draw a line betw...

@dave You'll see often that only one side is planed as a reference to which you have to plane the other sides plum and straight. So make sure that all surfaces are straight to begin with , but the bot...

Somewhere I've got some single topE strings. Somewhere ... Attachment : 20230104_144703sml.jpg