A possible 5 tank configuration, minus plumbing and mounting hardware. Quick and dirty.
ISPR internal Dimensions 79" tall, 41" wide, 33.8" deep
Tank dimensions 16" dia, 36" length.
Just a wag, but it could work with the right mounting hardware and plumbing with room to adjust in all three directions.
Yes I'm a graphics designer, it's one of my talents. I barrowed a generic ISPR with stand offs from my GWS interior designs.