Getting the boats into the water seems a bit rough.
1. there could be a tool tip that once you build the boats there will be 2 / 3 parts in your inventory.
2. when assembling the parts you can do this only on land - but then how to get the boat into water? i can see a hand-symbol (very small hitbox) that i can click with "F". But that doesn´t always work. When i push the boat into the water like that the symbol changes to a kind of circle - which works like a charm when getting into the boat.
3. when in the boat but not engaged in a certain position (as passenger or driver) it seems balancing on the boat is very difficult. maybe make it a bit more easy?
A bug i noticed is that if you place the boat in water and then push it off the water the boat falls onto the ground, which is okay. But if you dig off the ground the boat will fall into the hole, get stuck and after removing the earth it will float into the air. i tried this in singleplayer survival mode on a flying island in the sky.
first used the creative tool to conjure a square of water, then steered the boat off the edge and onto the flying island. then took away some of the earth and the boat ws in the hole. used creative tool to dig a hole and the boat was flying in the air (not accesible).