Good find ^^^^^
I am interested in designing an alternative gut bucket bass more than an EUB. I think the boat paddle neck is a great idea, however. I once built a washtub bass with a wheel barrow handle, with good results. My goal is to design at an acoustical bass that actually thumps and will keep up with a drum circle on the beach.
I also like this "rich man's wash tub bass"
http://www.gravikord.com/bass.html
I am still deciding if I wanna go the one string route or to try to make a proper fretboard design like that paddle.