Something like this? I don't think I have any better pics though.
It's made of 1-1/4" teak with 4 pieces of 3"x3/4" on the underside where the 4 brackets are. Cutouts for the tab actuators. I can get you dimensions if you want but we had it made in Miami in 1977 when we got the 23 from the factory. Its kinda rough now and in storage til I finish the rebuild but I have an underfolding Garelik SS ladder thats going on it too - it was a pain to climb up the outdrive.