A very good, detailed link. On a smaller boat that you are interested in a lot of that info may not apply. Suggest you be wary of cored hull and decks. Check inside bulkhead tabbing to the hull very carefully as it carries a lot of stress. Look for stress cracks or de-lamination. Same for outboard well area or transom mounted outboard brackets. Wiring should probably be simple on boats that size. I have no experience with swing keels or centerboards but, as on the inside and outside inspections, look for anything that looks like it has been patched or repaired, is frayed, or corroded. Spider like surface cracks in the gelcoat may not be critical but look on the inside of the area. If there are cracks inside , they may be stress cracks indicating excessive movement of joint areas. Don't be in a hurry.