I'm not sure now what to do. With reference to joining it all together. If your using wooden posts in corners how are you securing this to the base? So your not putting anything on the corners to waterproof your box?
Use coach bolts through the sides so 2 innthe front 2 innthe side is 4 bolts per post. Self tapping screws attach the ply to the posts liberal sealant to all the corners. And pop a trim on screw on and ensure more sealant
------------- The logic of my formula tells me your stupid because you prefer hotels.
sorry for the late reply just got back from a business trip in Portsmouth 3 weeks of the flat lands all to train someone to take my job at the end of the month.
Managed to get a trailer for £100 its def a maypole and has a 400KG weight limit, Jockey wheel and cover. No Rust other than the top of the jockey wheel handle.
Almost ready to start my project, and the redundancies is going to give me the time to finish it before Xmas.
------------- The logic of my formula tells me your stupid because you prefer hotels.
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