I want to build a bench with a 450mm overhang from the legs (long story why I need the overhang, and I already have the legs which are heavy duty steel monsters). The bench will not hold anything heavy, but I want it to be very sturdy and last a long time.
Having a look at the local timber yard, my easiest options seem to be Pine, Oak, and FormPly.
What thickness do I need for a 2100mm by 600mm bench, with 450mm overhangs from the legs on each end? Should I run a batten underneath it? What size? Any batten have to be near the back of the bench.
Also, what varnish/paint should I choose that is hard wearing? I'd like it to be very dark (almost black would be ideal).