Building a Rig - Possible to set up for both Scrypt vs SHA256?

[T50]

As the title states, I am looking to build a mining rig based on the Cryptobadger litecoin mining rig guide. I figure this will be a good entry point to mining litecoin and other scrypt-based alt coins. Then when ASICs for litecoin are available, I can just plug and play (I think?). Then possibly thinking about incorporating a SHA256 ASIC but not sure if it is possible for a rig to contain both GPUs/Scrypt ASICs/SHA256 ASICs.

Basically want advice as to how I can best position myself to be able to mine SHA256 and scrypt on the same rig? Might not be possible but any advice would be appreciated. Thanks.