When I moved my workshop into a brand new shed I built the normal bench, with a braced leg under the vice, which was 2' deep. So to match thre depth of the bench top I built new drawers also 2' deep. Most were partitioned so there was a front half for tools often used, the rear for tools too good to throw away. All were built by cutting, 3" X 19mm into the require lengths, straight screwing through the fronts and backs into the end grain of the side members (naughty!!). These then had plywood bottoms glued and nailed on. To fit them to the bench, I chose the crude way of putting in 1" X1" bits of wood to carry the drawers. Metal angle is much better (more slippery?), but the gap between the top and bottom of the drawers is a gap of 1", so the odd screwdriver handle poaking up does not jam the drawers.
For my hammer/mallet storage, I choose to make a series of pigeon holes to carry one item each, with steel plates, so the hammers can be slid in or out easily. Putting them on the walls seems a waste of wall space.
Given that I have 16' X 10' = 160 sqft of floor area, I would have preferred 20' X 8' = 160 sq ft., The extra 2' in the centre would only be useful, if I was working on some thing really big 3" scale traction engine? In my previous shed, I had partitioned off the last 2" across the end and just used it as a store for materials, so i had to siddle into it, bexause it had shelving across the end further reducing access. with the longer length there is more wall length for more machines (or longer ones?)
I have seen one natty idea for sweeping the shed out, it was a trap in the floor which had a long drawere fitted in it , accessed from out side. so open the trap, sweep every thing into it and close the trap, go outside pull the drawer out and empty it into the dustbin.. I did not use this idea as i thought stuffing thr under floor cavity with glass fibre would be a better idea.
The roof construction looked a little skimpy to me so I put in ties between the wall unrights, each of these were then loaded with 50 Kg of sandbags then tightly fitting props fitted to the roof purins, then the sandbags removed. One of the ties also served as a support for my mini travelling crane for handling the various heads for the milling machine.
Frank