I've only got 1800 to work with, so what goes in will stay within that general space and ~900 is max comfortable working height for me, the boxes alone currently exceed that so I don't want to build above them unless I remove the castors. I've got some old cabinets I'll throw up too.
Your bench suggestion is good, but Im hurt by your other bench comments as I think it would be easy, in short using gravity the same way they do them as accessories except mine would be two layers, infill for top of the box then full length bench across in a decent depth. Two boxes side by side only leaves 440 left in the centre, which the bench alone could handle, or enough to put their side cabinet on later.
I'd love the 60in but realistically at $1.5k it would be more valuable than the contents inside, my tools are pretty crummy. And I have no way to move it from their depot (250kg arriving on a pallet from memory). I just want somewhere to put all my shiz as well as misc small bike parts that are presently everywhere.