When we moved the entire American Civil War Museum, I measured every large-scale object's footprint and height, way ahead of time, then worked with the guys building the storage so that we had x linear feet of furniture storage whose second shelf was above 105" high and y linear feet that was only 46" and so on and so forth and mapped out the footprint of each major bulky piece on the platforms where they were being tetris-ed into, with blue tape and their numbers, so that every time a big piece came off the truck, it could go directly to its final destination and not crowd up the loading dock.
We were re-using giant boxes with trays, about 30 of them every 2-3 days, because the bulk of our collection was going from trays and drawers into other trays and drawers, and not living in boxes. So items were wrapped and padded, trucked across town, then unpacked. It helped to have pre-determined zones for each type of item. These ten trays just for holsters, those three drawers for spyglasses, etc. The thing that made that possible was a complete box-by-box and drawer-by-drawer assessment of what we currently had in storage, the type and amount of storage it currently took up, and whether it needed to be resituated and how much space that rehousing might take up. That way, we designed the entire storage space to have predestined room for everything.
The thing I didn't know is just how much stuff was hiding in nooks and crannies, and we had perhaps another 10% of mass of objects and archives just "discovered" during the move, and I had to scramble to arrange. Like why is there a statue head underneath the fire escape stairs??? True story. So leave yourself more room than you think, for generations of "we'll get to it later"s that you're going to discover.
OH and numbering, our Spacesaver storage that we designed was fairly straightforward, with rows of shelving and drawers and trays, and a few rows of painting racks. Our numbering system goes aisle A through R, "bay" each section of that aisle left to right, some have 3, some have 11. Then shelf 1 through 6, or tray 1-20 etc. If there was a shelf or two above a bay of trays it went shelf one, tray one, because despite being the second area in a bay from top down, it was still the first tray. Makes sense? It has been much more straightforward than "outer wall storage 8" like the last place.