how high are the sidewalls going to be?
I've had a photo of a truss on my pc's desktop for a while that may work....It's from the hamlet heavy timber website:
http://www.heavytimberwork.com/gallery_res_mont.html If the link doesn't take you right to the truss, then look at the photos of the pye residence...
Check out the photo in the top left corner of that gallery? This truss has curved members, but straight pieces would work also....
You could also consider a hammerbeam, but I think your docks would be crowded as the braces need to start low on the posts.
How many bents are you planning to use?
If you find a design you like, you could copy it and then take it to your favorite engineer for analysis and a stamp if neccessary
Looking through the many timberframe sites on the internet will provide quite a few ideas..
