Hi guys. I've got some ideas for the Pyro.
http://img263.imageshack.us/img263/2551/img0947c.jpg
Sorry for the huge photographed image, I don't have a working scanner.
Just some really rough sketches. If I've decided what direction I'd go into, I can refine those ideas.
For the flamethrower, I'd love to have either the default or my own gas can attached to the actual weapon. Similar to how the Medigun is attached to the thing on the Medic's back, possibly how it was intended to be. I'm either going for a shorter, more true to life version that's held with the Flare Gun's animations or the bottom one. Which is essentially a makeshift flamethrower which uses a car battery to ignite the gas. The latter is my current favorite though.
For the shotgun, I haven't really decided yet. I might do the lower one, with the rotating barrels. It could double as a Flare Gun replacement if it had 16 tubes.
I could skip the shotgun and make a hat instead though.
For the melee weapon, I looked at real life again. If you look at the fire axe, it's used by firemen to break through inaccessible parts to rescue people (irony in the Pyro's case though), I thought a crowbar would fit as an alternative.