I'm thinking of building a 12 x GPU rig, 8 of which will be running CryptoNight for Electroneum, 4 of which will be running Lyra2REv2 for Vertcoin.
All 12 of which could also be used for running Ethash to get Ethereum probably.
The equipments are on their way and I will be setting it all up in the next few weeks.
Would this work out alright?
Like the above person saying, you can set it up in a way where you can force the cards to mine a specific coin, but it needs lots of work.
First you need to know the order of the cards for that RIG, if you are using same cards for whole rig it should be fine, you just say the numbers, if you are using different card type then you should be careful while over clocking based on the order.
I still think you will end up with same yield even you mine different coins at same time with same rig or mining multiple coins.
Its hard to maintain that way! just my 2 cents,