While we still can't add shields, these seem pretty great! I'd love to swap ideas sometime.

Oh, hey, also! Real Overdose doesn't cure the Infection, I found out, which really sucks. :c
As someone with crappy ping, I play Medic a lot because it doesn't involve too much precise aiming. As noted above, it's real hard to cure a backstab playing as Medic, and your one regeneration weapon (Real Overdose) doesn't cure it.

Aside from that, though, I have a suggestion to rebalance the Air Balloon! Instead of making the Pyro fly, just make it so when firing they have the low gravity effect. It makes for less clunky movement, but it also restricts the Pyro from hitting the skybox!

Hey! It's not really much of a weapon suggestion, but I tossed around some ideas for some new mechanics for weapons, like the old Catcher's Mitt or a parachute for other classes:

Catcher's Mitt

Parachute Ideas for Other Classes! (Like the Heavy or the Scout!)

Hey, I like your model replacements for sure! Seems like a lot of thought got put into them.
(And I agree with changing the Matador's model. It just looks too...complex at the moment. I'd love a simpler design.)

Eh, I wouldn't recommend using a AW-style system. It was really buggy, for one, and I don't want to use another backpack! I'd rather just use the weapons now instead, since that's what I joined this awesome server for in the first place!

Oh man, these are gonna be so much fun to play! Thanks for all the hard work!

The Vita-Gun
On 100% Charge: Ubercharge automatically triggers on taking lethal damage
-25% ubercharge duration
-1 hp/sec drained from wearer

I saw this medigun on the SPUF blog and I thought it seemed like a pretty great idea!
It lets people play medic by dropping one of their greatest fears (dropping Ubercharge)
and sacrificing a fast build in the process. Players with the default Medigun would probably beat them out by sheer charge rate.

Possible Models?

http://tf2mods.net/mod.php?id=427
http://tf2mods.net/mod.php?id=421