Wow, Rennie, what a mess. Thank heaven, I'm not the only one.
My shop is small (dedicated 2-1/2 car garage), but mainly I knew what machines I wanted so there had to be floor space for them...this meant I couldn't allocate a large central area for a tablesaw and all the attached support to permit cutting full sheets. I rarely do that anyway since I work mostly with solid wood. So I did what Jerry did and set it about 4' from one of the overhead doors. This allows me to mostly rip with the door closed, but when necessary I can open it (not much fun in the winter). When I do need to cut a full sheet I use a Festool plunge-cut circular saw with guide...very accurate saw...often it isn't necessary to repeat the cut on the TS. I did need an outfeed table, though...any board longer than about 18" wanted to fall off the edge. There are a few sites out there with examples of shop-built drop-down outfeed tables (maybe here too...haven't looked), and I decided to do that. But I kept putting it off, and one day I looked on Amazon and there was a sale on the HTC roller outfeed table, free shipping, no tax, so I handed over my Visa number. I've been happy with it. Mostly it stays up unless I need to get back in the corner where my air compressor stands, but it only takes about 5 seconds to drop it down. I saw one user complaint that the guy couldn't get all the the rollers set exactly even...jeez, it's an outfeed table. It attaches to the base of the saw cabinet (drilling required), so an uneven floor isn't an issue. Two other things I did to my TS (btw, it's a Grizzly G1023...similar to your Jet) is attach an Exaktor sliding table to the left wing, and attach a router table with precision router lift to the right wing. So with the slider, the router table and the outfeed table, this is as big as I can tolerate in that space. So far it works well for me, even though the only thing that drops down is the outfeed table. I suppose you could say that there's enough support there to cut full sheets, but I can't do that. I always feed a little crooked, bind the blade, burn the sheet (and the air with invective), and one piece still manages to fall uncontrolled to the floor. So I gave up. Hence the Festool. I will never attempt it again. Feed the tool, not the sheet.
Cheers.