I said i would update this when i was done, so here it is.. I went with 2" pipe with 1/8" walls for a 1.75" ID.
I put in 1/4" rubber feet for spacers under the seat.. the seat i got had a bit of a ridge down the middle so when i bolted it to the plate it pulled the plate up a bit.
I also cut a slit in the back of the plate and sewed a really short loop strap to fasten the flip seat down.
So far i really like it and is really functional... I might have to upgrade my 8" oar towers to 10". The only thing that might save that is I am riding on 28" tubes.. I will see when it gets warm enough to get it out of the shop.
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