Sea serpent:a coastal raft

i am building a coastal raft,based on the vilma b,but most of the deck is cabin,not open deck,im trying to make it as cheap as poss,so i will use interior ply on the cabins,then put a tent over and place the insulation in between,the floatation is just old bottles and Polystyrene,and foam etc.

 

This is what I found on the project you mentioned.

http://www.floatingneutrinos.com/Vilma B/vilma_b_2.htm


Question is Why?

 

travelling,needs to be comfortable to live on,as i may in years to come.