slab,
We put the 4' uprights on with 2" staples. We got the idea from the place we get the uprights. They use them to build pallets with. I know its hard to believe but those big staple have more holding power than screws or nails. We tested all three and the staples proved stronger by far. And they don't split the wood. We were having to predrill them to keep them from splitting but not now. We bought some big pnuematic staplers and it is so easy now. As far as putting the runners on the 8' boards, we use a pnuematic framing nailer. We tried galvanized screws but they kept breaking when trying to screwing them in. The screws are so thin that they would sometimes break while going down the lake to drop the bed. Hope this helps. If you have anymore questions, please feel free to ask.
The only way to have a good fishing spot is to make it yourself!