The motor probably dates it to the late '50's, early'60's, so pre small radio. Everything was a straight runner then.
Any rudder fitted, probably off the transom, would have been not so much for steering, as a trim tab to compensate for side winds or hopefully causing it to travel in a curve, causing it to return to the same bank. Looking at the pictures, it looks like a sloped transom - that might have been a sticking point for the original builder and why it was never completed.