Found this Dense block of foam, floating in local Ashton Canal, whilst sailing other boats with my brother, whilst rescue a stuck boat from the reeds, in 1996 was temporarily on the dole at the time, struck by her Landing craft shape on turning it over plus realised I could carve it like wood, later using my bits box, after carving a couple of box shaped groves, for battery, motors and rc equipment, literal rammed a prop shaft, and rudder shaft through hull, and fashioned some balsa sheet into superstructure suitable camouflaged , I had a "US Army Vietnamese River Craft" of sorts and with its 1 1/2 to 2" thick Hull virtually unsinkable, hence its name :-). Here she is in 2000 sailing at Ethrow Park. May in the future alter her superstructure, she makes a handy towing barge for both mine and my brothers Tug Boats, and if rc left connected can even act as rescue boat if they pack up or get weeded up :-) - Have delete this from You Tube and replaced with slightly clearer version, but it seems to be still working here mysteriously, may cease working eventually, new version above :-)