That's interesting John. There was a thread going a while back about building a custom float. Personally I hate all floats and while I recognise the safety aspect I go without if I can (not often). I really hate complicated gadgets when diving (more to go wrong/tangle etc.). However if you got to have one there are some good ideas on this one. I like the retractable line but would want to try thay in practice.
Did note one point about stringing the first mullet. Stringer in mouth and out gills

. It'll fall off under its own weight if you do that.
Good thread for the tackle geeks this one. I'll see if I can find the floats thread and put on a link.
Dave