Another ST-RR Conversion

[RCParts411]

Whats up guys. Heres my ST-R converted to ST-RR (except for shocks =/ )
Anyways its a slower build considering I've got some other expensive hobbies.

Anyways so far heres the specs

RC Monster Motor Mount
Airtronics 94358 For steering
Spektrum RX

Mamba Monster with 2200kv combo. Just ordered it today.

Couple of questions I have for you guys. It will before racing, probably should have gone for the 2650kv but oh well.

What battery to you recommend? I'll be racing at Revelation in Southern California which consists of 2 ten min qualifiers and a 15 min main.

Do I have to run a 6 cell or can I run a 4 cell? I was thinking of getting 1 5000mah 4 cell and then 8000mah for the main ( 4 or 6 cell? )

I want to keep my RX safe, I've heard of people using revo boxes. Any alternatives?