Word to the wise: find a supplier that will work to a cutting list.
Not only is buffalo board heavier than the equivalent ornery ply, it's got very sharp edges, and the melamine dulls cutters and sawblades faster than you can imagine.
I re-decked a scaffold about five years ago, and added kickboards, all in buffalo board. I am extremely glad I got the basic shapes ready-cut from an 8x4 sheet.
My improved design required 8mm pronged Tee nuts to be sunk-in under the deck, so that the brackets for the kickboards could be bolted to the top. From memory the Tees are 20mm diameter. and as a precaution I bought three new Forstners from Axminster to do the recesses. I got through two of them - blunt as John Prescott - after about only 8 holes done with a drilling jig to keep them neat. The drill for the 9.5mm holes fared better for some reason. The plunge saw blade did better, but it's TCT.
I sealed the edges of the decking and boards. The proper Buffalo stuff is thoroughly impregnated, but the board I used wasn't, although it seems to be pretty waterproof all the same.
I've used the offcuts as aux fences on the router table - one side is smooth the other side rough. It also made a handy sliding carriage for mitre lock joint cutting (the awkward bit with the workpiece up on edge). Bit annoyed that I stored it on edge this winter and it warped.
E.
PS: an old friend who used to manage a theatrical technical hire company used the same board as I did for all their rostra (same supplier too). He says it _is_ pretty waterproof, despite my pessimism. They used to re-deck them every couple of years or so - the edges would wear and the fixings break, but the boards didn't disintegrate, despite regular soakings outdoors. They also used it for flooring of audience grandstands, etc. Our supplier was Avon Plywood (Keynsham), now Sydenhams (
https://www.sydenhams.co.uk/branches/sp ... -products/). Bigger firm, so they might deliver up near you...
PPS: the grade used was 1/2" replacing similar board. But it's heavy: I have to install it with block and tackle, as now I can't lift the finished deck high enough on my own. The kick boards were designed to go on afterwards.