Superb dude. I am not involved in mining big. I am research about mining and finally now arranging to go with the 2 altcoin mining rig one is for eth and one is monero. I will go with Nvidia 1070 TI cards 6 numbers in each rig. Will it profitable to mine Zcash with the specification I said. SSD would 64 GB and 8 GB RAM.
GTX 1070 is overpriced at current pricing for ETH mining - you'd do better to build an ETH mining rig around AMD RX 470/480/570/580 cards now that they're commonly available under $300 again.
SSD is a waste on a pure mining rig - I'd go with a low cost hard drive or a USB flash drive instead.
8GB is overkill for a pure mining rig but does offer some future "room to grow", and it's not all that much more expen$ive than 4 GB any more.
Yes, your planned rigs SHOULD be profitable on ZEC mining - as long as your electric cost is not crazy-high.
I CAN'T say if it will achieve ROI though, way too many variables like "future ZEC pricing" that I don't know and NOBODY can predict, and I also have no idea what your electric cost is like.