The total project used about ten pallets, every part, has been coated with Linseed oil on both sides, any exposed end grain has been treated using a more substantial sealant. Most of the structural joints are held together using heavy-duty nuts and bolts; everything else has been screwed together. The approximate amount of hours spent is hard to determine, but it was created over a period of 4 weeks. The most difficult parts of the project were the sheer size\weight of it and the fact that we have limited flat ground here.!
More info: adampinson.com