Blah blah blah ;D One more post.
One more thing - I was very interested in adding henchmen in, and one of my ideas was something from the Iron Kingdoms - a gobber armed with guns. (Gobber = Goblin). With big goofy goggles and a 6 shot pistol, with feats from Swashbuckling Adventures to help him out (Hip Shot = AoO w/ Pistol in 5' radius), I thought of him as a hybrid Jawa-Gnome. Tinkering with scrap metal and machines, wearing goggles and always covered in oil and grease.
But I saw your 3 Dwarves and thought, wait a minute ... why not three Gobbers? What can three gunmen do? Why, crew a bigger gun of course. Arm them with a pistol for self-defense, but like a machine-gun crew they each carry a part of larger weapon for the larger battles. The "big gun" would be a cannon or experimental rotary gun, I'm not sure.
(Not even sure if I have stats for a rotary gun; I think D20 SA has them though. I'm not sure if they could piece a light cannon together either. The only stats I have are from Hylars 12lb in the 3rd Book of the Witchfire Trilogy.)
They'd probably stay in the back of the party though, since they'd also have to bring barrels of gunpowder with them. Maybe like Desperado, and make them all eerily efficent gun-brothers.
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Leo, wouldn't adding in 7 extra similarily equal level NPCs make the game to easy without adjusting the encounters? And again, how in the world will you manage so many? Give the players the character sheets to save time during combat, for example?