I'm down for WWI biplanes and artillery; maybe tanks so long as they're not behemoths. More like the Renault FT. I'm cool with airships as long as they aren't bristling with siege artillery-caliber guns.

Maybe the RP ought to be advertised as WWI-era rather than steampunk. Don't think it'd be dieselpunk either, as we're not at interwar-WWII tech yet.