I currently have a 60Ah CALB pack in the boat. Those are installed on a plywood shelf with a frame around the base of the batteries, made of ~45x20mm lumber, to keep them in place. Nylon straps hold the cells down. I'll try to snap a photo next time I'm at the boat.
For the new cells, I'll make a similar shelf. Not sure about how to keep the cells down. Nylon straps seem a bit inadequate for this bigger pack.
I have no temperature regulation for winter storage. It never gets that cold here. Very rarely below -10C. Never below -20C. I never use the cells during winter storage.