Since on easy mode you can die without losing everything the only things you will need on the raft is research table, sail, smelters 1-2, receiver, 3 antennas, storage (optional) and disposable anchors. minimum raft size is 2x2 with the posts on the outside and the second floor set up outside the 2x2 to maintain the sail clearance in the middle and for receiver and antennas to be stationed up top along the edge