couple of good interesting death meathod sugestions:

Drowning (especialy in that piss vat) would be a good way for someone to go... maybe one of the main girls chooses that... or the limbless cutie goes too far (accedent? or deliberatly)

nothing says butcher shop like ground meat... why not have a human sized grinder to make a cute little girl into sausage? feet first so she feels it (and could give someone a blowjob on the way down) or head first so she goes quick.... (and could have her pussy fucked as she's fed into the machine)

the simplicity of a slit throat could be expanded on.... move the cut to the wrists like a suicide, the meatgirl will slowly bleed out but still be able to do light work and help around the shop as she slowly dies from bloodloss... or, of course, get her brains fucked out while she slowly drains

thinking of brain fucking.... theres a good snuff meathod right there. dick into the skull, either through an ear... through an eye... or drill a purpose built hole with a boreing drill, then insert a cock, or probeing hands or fingers to stir the cowgirl or sowgirl's brain to mush