Help with new build?

Got a few questions

biggest alt I can get is a hairpin 270A from Mechman or Singer. Which battery and how many should I run if ill be drawing 5000-6000 watts?

2nd. I need a couple amp suggestions. Have two orion hcca152 at 2 ohms. 2500watts eaxh. Could have one amp or strap 2. Any opinions on amps? Could also usr an opinion on a mids/high amp.

 3rd. If Im strapping 2 seperate 2500 watt amps, can I wire each sub individually to 1ohm in this case? 

Thanks in advance

 

 if it helps, vehicle is a 2010 Foreste