Those Pendleton safes are pretty sweet but I already have a Browning that is in need of some major organization. It's about to explode. I have a lazy susan bearing (thin plates that spin with mounting holes) from an old project and would like to adapt some round pieces of plywood to a section of pipe with flanges top and bottom. I'll most likely put any really long rifles/shotguns in the corners off of the carousel so it can rotate and still allow me to have my upper shelf. Anyone ever made one, tips? Something like this image:

Mine looks something like this but worse after adding more items:

I have no tips for construction, merely for use:
The rotary rack is very convenient, but is horrible for space efficiency.
If your safe is crowded now, a rotary rack will only make it worse.

But it does mean you'll have a good reason to buy another, larger safe.

Thanks but I've had to take down a door frame to get this into our closet and it's not going anywhere. If anything I would buy a smaller, lighter safe to put upstairs to store less important things in. I guess I will map out the space/layout change and see if it's worth the time and effort.

Hmm. Nice idea. I'll make one at work on the cnc router.

That's what we found as well.  Expect to halve your capacity.

Interesting. Never would have thought it would be a major impact. I have seen some people who've made inline racks that slide in and out for better access. Might be another approach using door slides.

Better, but still significantly reduces your capacity. Like everything else in life, convenience comes at a cost.

If you really want to maximize your safe's capacity, remove all the racks, put every long gun in a (labeled) gunsock, and stack them alternating muzzle up and muzzle down.
Doing it that way is definitely not convenient, but it allows you to approximately double your capacity, i.e., get as many guns in there as the manufacturer claims you can.