something I've used
in the past, and I found out about it by accident, is poplar, back in 97 or 98 my mom needed some garden stakes for tomatoes and a few other plants, so she asked if I could dig some up for her, was doing a house in poplar so I ripped the drops into 3/4x3/4 inch stakes, and she used them in the garden, she was still using the same stakes when she moved last year, they aren't varnished or anything, and they're in the garden all summer long, then just leaned on the garage outside during the winter, used poplar on a couple projects, figured if they lasted that long untreated they should last quite a while varnished up on a boat, the garden stakes are showing a bit of wear on the ground ends, not realy sure if it's rot or wear, and the rest is a very pale grey, but still strong. pop can be dressed up very nicely, and looks great if you get clear white pop, the green or grey streaks in the other types sometimes look funky though, but looks good with a bit of stain.don't know if I'd use it for grab bars, as I haven't any idea about it's 'tensile' strength, hatch boards would be fine.ken.