View our collection of diy sailboat plans that feature boat design for sailboats of all types! we have sail boat plans for yachts, day sailers, and more.. Selecting a boat for offshore cruising before starting the boat selection process, it is imperative to find out if you really like sailing and are comfortable. 25′ (7.62m) or 27′ (8.23m) dive boat or just fun boat. beam 10′. draught (hull only) 1’5" for construction in either plywood or steel, or as a mould for grp.