I have given up on the shooting port idea. To many safety risks upon further consideration.
I live in a less than perfect floor plan for old age. It has 2 levels: The top walks out the back, and the bottom walks out the front. With a split entry.
My reloading room is down.....I can walk outside in the front but am in the ground in the back. I always thought it would be nice to have a port underground but I don't have a 100 yards that way. The thought was to dig out a "tunnel" 4' wide with a concrete lid and conc. block walls, with a locked trap door at the end for to set and retrieve targets. It's only a dream since I can't discharge a gun in the city limits anyway.
In your drawing you have many presses. I will only need 2 spots as I will set up a progressive station and then a turret/rockchucker station. I actually like my current setup where the presses are in cassettes that I can switch in and out with ease.
I only have three, but I'd LOVE to have a bench like his with long arms either side of my Pro 2000. Also I don't plan to limit myself if and when the itch comes to get another.
I can even conceive of having another Pro 2000 so I can keep one setup to load pistol and the other to load rifle. Heck, I wouldn't mind having a Dillon 1050 to play with in the future for that matter.......that would make 5.
Right now it may not make sense to load shotgun for trap and clays with a Walmart close by......but how close is your Walmart? And how long will they sell shotgun shells.
With all the space you can have available, don't limit yourself to the present if you don't have to. The most important feature, of course, is to make it to please you, but since you gotta store each press somewhere anyway, presses mounted permanently (with dust covers of course), ready to load, any time I get the urge, make more sense to me, than the quick switcheroo, unless you are like my wife, who insists that all her counters are empty clean, and appliances are unseen until shes using them.
And that's perfectly fine too!
Oh, BTW, think about built-in timered outlets for your tumbler/s.
They are way nicer than the add-on variety. You can wire two separate timers to each duplex outlet, one for the top and one for the bottom. The timers can be ganged into a double-gang switch box. I use one....really like!
And why do I use CO2 bottles rather than an air compressor? Silent compressed air......dry compressed air. Perfect for airbrushing a stock too. Again, it's silent, always ready, and you don't have to deal with a water trap to prevent water in the air line from ruining your paint job.