Welcome to RC-Monster!
If you can email Mike, the owner, he can set you up with a motor mount. Then all you need is a battery tray, which you can select from the store based on the dimensions of the battery you plan on using.
A good setup in my opinion would be the CC Mamba Monster 2200 system:
http://www.rc-monster.com/proddetail...MBO2200&cat=20
Then Mike's battery tray:
http://rc-monster.com/proddetail.php...MFPbatterytray
A good battery would be something along the lines of these:
http://www.rc-monster.com/proddetail...=PQXP4s500025c
http://www.rc-monster.com/proddetail...3150sp255s4500
But of course there are lots more choices for batteries.
SH Z-Car, Custom Crawler, 8s Savage,
12s XTM XLB 1/7 buggy,
4wd 4-link rear/IFS Pro4 truck,
Custom Hyper 10 Short Course,
Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz