I actually have a Parrott / 6 Pounder combo, it was in one of the Renderosity Mag CDs. It is set up with switching geometry so the iron Parrott tube switches with the brass smoothbore, pretty trick, I though. They are on the every-popular 6 pounder carrage, which is slightly smaller than the one the Napoleon used (same wheels and limber, though). If enough people beg me I'll make it available again. I realise (of course) not many people put Civil War artillery in their renders, but maybe they should, they are nice models. ;-)