How to connect the crossbeams to the amas

So, connecting the crossbeams to the amas......you could lay the 3 inch aluminum tubing directly on top of the amas and connect using a treaded bolt and washer.  But, that would tend to make the crossbeam itself  dig in the water when the leeward ama is being pushed down, potentially really slowing you down.  But a place called high performance silicone hoses makes aluminum 90's from 1 inch all the way to 4 1/2 inches in diameter.

This one pretty much says it all....Look carefully....on the left, you see the inside of an ama, where a piece of  wood goes from one side of the ama to the other side and is glued in.  Then a grey piece of fiberglass tubing from a ham radio build your own tower website place up in Georgia goes into a hole.  That hole does not go all the way thru the wood base.  Rather a hole saw made a groove in the wood for the outer diameter of the fiberglass tube, yet, it still did not fit, as the inner diameter had to have another smaller hole saw use the same pilot hole to make a groove for the inner diameter. now the fiberglass tube fits the groove and can be glued in.  Also notice the tube is next to a bulkhead..Conceivably a set of holes are drilled into the bulkhead and a ziptie zips the tube to the bulkhead, as well as epoxy of PL fillets.  On the right above, you see how the ama top goes over the fiberglass tube, nice tight fit and then an aluminum tube goes into the  fiberglass tube as a spacer and finally the 90 degree aluminum bend goes in.  Also notice the word "ok"  That is where a few wraps of wetted fiberglass goes around the  90 bend so that it will be a snug fit in the crossbeam tubing..  So, what you are seeing above is 2 amas, one with out a lid and one with a lid .

I am still deciding which way to go on this, but I think that the 90 degree bend is the way to go. It has the effect of putting the crossbeams about 14 inches above the ama.  A cotter pin secures the pieces together.