I just cut out the deck, joined sides and ends to it using 12mm x 12mm square section, to keep everything square, it was all done by eye, about 2 hours work to construct with out painting The bollards were dowling, drill hoes in the deck and glue the dowelling, cut to size after tapping in to the holes. I do take more care over building boats!!!
Maybe this is an idea for a tug towing contest, turn up at event with some plywood, glue and tools, knock a tow together and run the towing course, would be interesting to say the least!!!!
First to complete course wins
Andy