Im GM of "Not Mushroom In Here" (EU-Magtheridon-Horde) its a Mb guild plus a coulple of old mates currently we have

Me - 5box - mixed group
My Gf - 5box - mixed group
Other - 4box - shammy
Other - 3box druid
solos: 2 x DK

We're looking to increase our multiboxer ranks to build 25 man content teams, class / level isnt an issue, just dont be an idiot is about the only guild rule we have going.