Some tips on bench design if you haven't already considered them.
Fasten securely to a wall.
An outside masonry wall is best. An interior wall transmits the bumping throughout the house.
Bench height in relation to your arm movement is critical. Determine where the downstroke would be most comfortable because that part gives the most resistance. Measure where the bottom of the press would be from that that position. Your arm should have a slight bend at the elbow at the bottom of the stroke. My bench is 41" off the floor but I have long arms and a medium height.
My first few benches were either too high or too low to be comfortable for the long term.
The bench top doesn't need to be but so deep because you'll be handling small open bins of very small objects. Mine is 21" deep with a 7" deep storage cabinet at the back giving me 14" depth. I've never needed more than that for a working space. Sorting and other processing occurs on another nearby work surface that doesn't need to be so stout.
A gentleman from Pittsboro whom I met on one of the NC firearm forums was kind enough to build me a reloading bench (I did pay him) so I have a template of sorts already here, the problem is it's the perfect size to do all of my firearm tinkering so then the reloading part became an 'add-on' that has only been added on a few times since the conversion. My issue is that while I have a good sized single car garage as my workshop it is getting smaller since now it's a triple duty space (storage/firearm work area/wood-working area).
As I see it, I want to do 3 workbenches.
1. Woodworking bench that will hold my portable table saw providing outfeed space, miter saw that can either hinge down or just remove and store underneath and maybe some drawers or shelves but at least storage for other WW tools (drill press, router, circle saw, etc). I want this table movable so I can stow it under some storage shelves I also plan to put up instead of the poly shelves I have now that frankly waste a lot of space.
2. Bench for reloading, both single stage and progressive. I use the Lee bench plate so I can switch presses. Need enough workspace for everything I need while reloading. Here's the kicker, since my current workbench is already attached to the wall I was thinking if I can devise a removable but sturdy connection setup I can stow the reloading bench when not in use which means the actual reloading bench itself can be relatively small since I can use the attached workbench for workspace.
3. As you said a case prep table doesn't need to be as sturdy and while I could use my current workbench I want to keep that space as free of any sort of metal shavings as possible. The work/prep bench I want to be able to store things like tumbler, prep tools, etc in and also be able to move this out of the way like the other two.
I've been spending a lot of time on youtube looking at different workbenches so I have some ideas. I think I'm getting to the point of saturation and I just need to sit down and draw something up and start cutting.