Since furnishings are hard to stack, currently one of the most compact storage layouts is a simple shelf with four trunks for a total of 35 x 4 or 140 slots.
The storage options that are "better" than the trunks are too bulky and cannot be stacked with the same small footprint, making them actually inferior for storage density, which is directly related to ease of access and sorting. They are basically good only as cosmetics.
Would really like to see some kind of overhaul here, where workshop high-density storage can be evolved and improved.
