A simple way to mount the floats on a low wing. This is from http://www.pacaeromodel.com/Knockabout/Float/struts.htm

The floats swivel around the spreader bars. To remove the wing, you remove the wing bolts, tip the floats forward and lift the wing out. You can take the front strut off also, or just tip the floats back and reinsert the wing bolts to hold them on the wingless fuselage.

Jim