My absolute favorite framing tables are the 36 x 80 doors that I buy down at Lowe's for $28. The doors are supported by cheesy fold up tables. Between the tables and doors is stiff carpet that is contact cemented onto the plastic table. The carpet is so I can slide the door around to different angles when working on those big frames, just the right amount of friction.
I have some extenders made from 1x4's and steel L brackets the will raise the surface of the tables to 63 inches when I want to use the underpinner. Also creates a second worksurface under the door for tools and such, very handy.
Sounds pretty crude, right? But somehow I manage to knock out a lot 3.5 x 8 foot framed pieces on those little surfaces. It's so organic. Let's see...when cutting mounted prints I cut directly into the surface of the tables. When I wear out a section of table, I flip it 180 degrees horizontal. Then I flip it over. Forget using scrap matboard and Gator, meh! Slows you down. So for $28 I can do the cutting for about 80 large frames, then I toss the door and get a new one. It's actually cheaper than using fancy cutting mats.
When working with frames taller or wider than the tables, I use scrap 2 x 5 foot x 1/2" Gatorfoam for extensions.
When "closing" frames I lay large bath towels over the table to protect the front surface of the frames.
I also have a nice 4 x 8 foot table surfaced with Melamine. Great for manually joining polystyrene frames, and cutting mattes, but a little too big to get from one side to the other conveniently. It is often used to pile up intermediate production pieces. I prefer the doors for most things. Melamine is great low friction surface for when you have to maneuver big things, or where you need a squeeky clean surface for things like for matting, for which I care little.
Won't get into industrial philosophy here, but I could. I know from long experience that if ever I took the time to do this stuff right, I would fail immediately. Seen it happen a bunch of times to others. Lean, mean, and to the point keeps you alive. Worrying too much about the facilities = industrial distraction and corporate death. The stories I could tell. Stay focused, just get it done. Amen.