Currently, i stack some of my sustainers under my MFT's and some in rolling boxes I ave made. If i need a tool that is stored in a sustainer, whether under a workbench or in a rolling cabinet, or even in a freestanding stack, I only need to deal with the stack where it is stored. When I remove the individual sustainer, i do not find it necessary to reconstruct the entire stack or perhaps a workbench. That system, to me, looks to be a lot of extra hassle. I think it would get very old very fast. [2cents]
Tinker