Need photos of the original wood covering the opening on both sides and behind the engine cover. The only piece left is what the battery switch is mounted on. Looks like 3/4" plywood. The engine is a 4 cylinder 170 Volvo.
Google "sportscraft 222 pics" you may see something you can use. Also even if it's a larger boat back from the day
you may still be able to get a visual to pull off your repair.
Best of luck. Keep posting. :**
I'm rehabbing my sportscraft 222 but its an outboard. Like MP said. You'll figa it out.