I've measured the seat height using a kitchen chair, although there are ergonomic text books out there that provide stock measures like these. It's around 18" and so at the 5/6th scale we're working at, that's around 15" above floor-level.
Here I've cut four lengths of tube of 13" apiece, although the M6 threaded inserts at either end amount to around a centimetre off that, which meant that I cut to 320mm.
Fore-and-aft sections are fixed in place at the predetermined height with dome-head bolts ideally, for aesthetic reasons, with the lateral seat supports eased into place for a look-and-feel.
Counting 50 more pop-rivets, four corner brackets to be used soon and a can of red paint we've spent an another £9.75, bringing our total spend to just under £20 to date.
