Hi all,
I've been looking at making a washtub bass, but have recently considered making it like a bass guitar hybrid. You see, my band has been thinking of doing some acoustic busking and our bassist has been thinking of making a washtub bass but is put off having to learn to play it a certain way.
My idea is to make a washtub bass but have a neck and (fretless) fretboard with proper bass scale length with two or so strings. Is it as easy as bolting a plank to a tub and running the strings (which I'm considering using double bass strings for) into the tub?

If anyone can help out, that would be very appreciated!