Been messing around on the wowhead page:
https://classic.wowhead.com/raid-composition
Never actually raided in vanilla, but I think something like this would be cool:
https://i.imgur.com/bFwLTxY.png
The frost mage in group 1 and the shadow priest in group 2 would be there for applying Winter’s Chill and Shadow Weaving. This is to synergize with groups 7 and 8, which are stacked with Arcane Power frost mages and Shadow Mastery/Ruin warlocks backed up by a balance druid each for the 3% spell crit aura.
I loaded up group 4 with rogues as I figured they would benefit most from Leader of the Pack from the offtank feral. Left the holy paladin in there for auras and heals on the druid when they have to tank.
Groups 5 and 6 are pretty much the people I expected to need the most babysitting, so I put them under the careful watch of a restoration druid each.
Kind of ran out of ideas for what I needed, so I threw an arcane mage in group 3 and called him the main crowd control.
EDIT: https://classic.wowhead.com/raid-composition#0gcnpHgqnpHgGnpHvhhFHwhjjFwhjjFxddddxyyyy