It would certainly ruin the Opti, and the bulkhead you'd have to have to make it two pieces would probably be right where you'd need to sit in order to keep the boat
from digging in the bow or stern. So you'd have to sit on the bulkhead, making the boat really topheavy. Sitting up that high would make it difficult to keep clear of the sail - the boom would be about the height of your stomach. Optis are not designed to row or to take a motor
. Doing the limbo with the boom, plus the rather minimal freeboard, would make swimming lessons likely each time a powerboat went by. Does not sound like fun. Build a nesting dinghy (that works as a dinghy) instead.