I recently joined the Rotary Club here at Subic Bay and have just been tasked with designing and constructing a boat made from recycled materials. The race is coming up, so this thing has to be ready by next Monday. I'll have plenty of help putting it together, the college students who belong to the Rotaracts, an offshoot of the Rotary. I'm planning on using 5 gallon buckets filled with empty plastic water bottles in a catamaran configuration. It should be very stable in a 6' by 10' size. I did some research and 1 five gallon bucket gives 42 lbs. of flotation, so 12-14 buckets should give the 500 lbs. I need for 2 people. Here's my rough draft: