Mine is a 3.5' x5.5' table with a removable top. The recessed well is 3x5 and has 2.5" depth. It's lined with a dual sided matt, similar to a mouse pad. One side is blue, the other is burgundy. It's got 4 rotatable drink holders but honestly, most people find they get in the way. I wish I'd mounted them on a rail so they could slide. It also has some slits cut into the tops of the tablewell edged so that people can put cards in them. I lined them with felt but obviously not well enough because most of it ended up on the card edges during the first few months of use.
As for being sweaty in summer. I'm not 100% but I think it says in the bylaws that, as wargamers, we are required to be clammy or wetter at all times. Brant can give you the legalese but I think you'll be good....and damp.