I have multiple sizes and quantities of dock frames that could be used to make a large swim deck and walkway. They could be modified slightly to create a floating dock with boat slip.
The frames are made of structural steel angle and hot dip galvanized.
Sizes are
3 frames @ 4’ wide x 32’ long x 12” tall.
9 frames @ 4’ wide x 28’ long x 12” tall.
I also have floats available. The price is $15 per sq ft.