Disregard the 3 table saws attached to each other, but the idea here is to run the assembly/outfeed or A/O, table the long way behind the saw with a "bridge" in between with the miter slot dados. My "bridge " is permanent, but a flip down bridge would work in a smaller shop. You can make both the saw support stand AND the A/O table mobile if that works best, or just one. Which one would depend on your shop layout.
The biggest issue in my experience, and I'm on a wood joist floor for this shop, is that concrete in not level enough for mobile tables unless you have adjustable feet/pads along with your casters. You always need a smooth transition from your table saw to your A/O table. Even a 1/16" bump or difference in height to the A/O table will prevent the work piece from sliding onto the A/O table.
I had such a bump develop over a 10 year period from the joists settling an even though both the saw and the A/O table were level, they weren't at the same height, the A/O being 1/16" higher. That meant raising the saw or lowering the A/O table and corresponding connecting bridge. It was a PITA to get them close enough for a smooth transition.
A solution is to make the outfeed support a flip up so it's always attached to the saw itself and have a separate assembly table, which is not used in conjunction with the saw for the most part. An assembly table which is 1/8" to 1/4" lower would allow for the workpiece to drop slightly and then slide without interference.
Ok, that's the biggest issue when working with unlevel floors and 2 different mobile tables.
I store almost all my lumber, mostly hardwood vertically, like Tony B.
I do not have a place to store plywood in this shop, but down below in the garage which is another PITA, unique to my situation. My wood shop is on the second floor which means I need to break down the plywood into manageable sizes to get the piece up the stairs. Humping a full 4 X 8 sheet upstairs is just not going to happen without help.
If in your case, you could break down the plywood on a separate support surface like saw horses, before it gets to the table saw, that would save you having a long outfeed on the table saw. However, ripping an 8 ft long sheet, whether it's a or board or plank, still requires about 18 ft of straight run in any case. A front support is always best as well as an outfeed support. I use H-F roller stands occasionally, but they are not very stable. I made a large crosscut guide for 4 X 8 panels from 1 X's and Masonite. The Masonite was attached under the cross piece leaving an extra 1" and then the saw was passed over it leaving a zero clearance, no measure guide. This is not shown in this post, but added later based on a suggestion: