How cool would it be to craft floating boats and vessels? Pretty damn cool, I know. Here's my thoughts on how the process would work: Make boats able to be built upon. If you could connnect 2 or 1000 boats together with various other blocks, think of the possibilities! RS torch connections to waterfalls that motivate elevators! Watercraft that actually move! Epic sea battles of cannon launchers? Oh fun! Somebody talented, please take a look into them poor lil wooden boats and find a way to make them take hold of other blocks! Thanks.
Ehh, do you want to connect blocks to boats? Because it's impossible to let blocks move without teleporting them. But it's maybe possible to connect boats/minecarts to each other.
Preferably it would be cool to make the boats only accept blocks on the top. This way, you could place a foundation block on top of one boat then successive boats could be connected to each other horizontally which would mate them when their foundation blocks were locked. [Plank][Plank] [ Boat ][ Boat ] [Not Sticky] Or at least, if you cannot determine only one side sticky, just make sure you build the boat in deep enough water that it doesn't stick to the floor.
Hmm, it sounds like a very good idea, but I can't make it for you because I have another plugin to-do list right now x). I hope this plugin will be released soon.
Boat's (and Minecarts for that matter) are considered entities by the game (like mobs and players, as opposed to blocks). You can't "build" anything on an entity because it's not a block. Further, entities have a really funny way of keeping position, so might move a boat 1/2 a block, but the above structure wouldn't move at all, because 1/2 rounds to 0. Summery: Op's request is not possible.
I am saddened to hear your reply Afforess, though I somehow felt this would come to be. There goes my dream of naval battles! Thanks for your response.
Well - Notch mentioned enhanced physics in the Bukkit modding meeting, so that may mean in the far out future, your dream may well be realized. But it could be 6-12 months from now.