Just an update, I found a cheap way out for floatation of a dock. I located a food distribution place called Krynos, they have hundreds of plastic drums (happy to give them to you) They were used to transport olive from Greece, so there are no chemicals.These drums have a big screw on top instead of 2 small ones. Then instead of filling them with foam, I started stuffing them with 2 litre plastic bottles. Turns out you can fit 52 2litre and another 20 smaller water bottles inside a 45 gal drum. With all of these smaller closed air pockets there's no way a drum could sink.
Dave, if you read this could you send me the pictures you mentioned early in this thread. I'm drawing up plans and they could be a big help. THANX Jimmy
