Stuff

The only real thing left to resolve is the viewmodel effects when disguised as another class. A few ideas:

Ideas

A: ETF style translucent weapons. The weapon actually equipped shimmers and changes into the weapon people see you carrying in 3rd person mode.
B: Display the corresponding viewmodel as held by the class you're disguised as. Forget the spy's weapons.
C: Display the spy's viewmodel. Forget the disguise weapons.
D: Same as B or C, but instead of just forgetting the spy or disguise weapon, use some kind of HUD element to indicate which weapon you're holding.

A: Cool, good blend of both worlds / Harder to implement. Probably requires more resources to do (both time, effort and computer rsources [lower framerate etc]). Requires weapon models to be activated to be of any use.
B: It's easy to remember which weapon you've got selected as spy anyway, pretty easy solution / Requires weapon models to be activated, will probably require more memory as you will potentially be displaying more viewmodels.
C: Simple, no hassle, no extra resources required. Newbies probably won't care about the intracacies of holding the correct weapon anyway. The veterans can learn the combinations anyway / Not as easy as it could be; no wow factor.
D: All the advantages of either B or C, but with the extra functionality if people need it. Doesn't require viewmodels to be on. Could be turned off if a player finds it annoying / No wow factor.