You are letting your imagination go wild. Water coming out that seam is absolutely normal, don't worry about it. If fact if you look at the forward end of that seam you will see an intentional drain hole. Any water that comes out there has gone through the cooling system and done its job and is on its way back to the sea anyway.
And those water tube guides are just that--guides to help you insert the tubes when assembling. Once it is all together they do nothing--except dance around in there and shinny up the tubes.