I will second the Cumaru. I used it to make a set of grab rails for my previous boat. I bought just 1 decking board, a true 1" thick. It is a very tough wood, so you need high quality tools/blades to cut it. It smells a little when sanding, so you want to have ventilation when you sand it. Its incredibly hard, so any holes must be pre-drilled before putting screws into it. (ask me how I know) The stuff looks great. I left it unfinished for a year, then sanded it lightly and put an oil base on it. Very beautiful wood, and IMO looks much better than Mahogany. I see you sail in Lake Geneva. If you live or don't mind driving south, Owl Lumber is a good source. They are in Lombard, IL.