Re: what glue for attaching foam insulation to the cabin interior?
Peter, silicone is the wrong adhesive. It costs a lot, has a high strength, and in that use? You need near zero strength. Look for a commercial carpet or flooring adhesive, or a latex "cove molding" type adhesive. Spread it on with a notched trowel, make sure it is designed to work with the padding you are using.
Of course, if you thoroughly glue down the padding that's gonna be a b|tch to ever remove, you might prefer to use double-sided carpet tape or just lay a 2-3" stripe of adhesive around the edges and in critical locations where the contour changes.
Offhand, "removable" says carpet tape to me, not adhesives.