DIY Two Man Rowing Frame

Step 1: Get a raft.
Step 2: Get your buddy's one-man pontoon boat's rowing frame.
Step 3: Get some ropes and tie that thing down however you can, and make sure the ropes are tight.
Step 4: Stuff a folding chair in the front of the boat so your buddy can ride in style.

Step 5: Catch fish.

Mission accomplished...