The cabin includes a sleeping loft, accessed by a ladder. "I installed batts of insulation, then used an electric stapler to attach Tyvek to the rafters," Foster says, describing the tented ceiling. "I started from the bottom up. It got easier the higher I went, because I could just slide the batts into the Tyvek 'pockets.' Then, I attached a bolt of Walmart lace with the electric stapler along the rafters. Bada bing."