Hey,I'm currently doing an ST-rr. The Kyosho motor mount Mike(Rc-Monster) sells is the one you need
http://www.rc-monster.com/proddetail...rcmkyoshomount
You'll also need a battery tray
http://www.rc-monster.com/proddetail...MFPbatterytray
order size according to the battery you choose.
For batteries Li-po is the way too go. I use PolyQuest 5s
http://www.rc-monster.com/proddetail...=PQXP5s500025c
but there are alot of less expensive batts out there. Try a search on Zippy or True RC
Motor wise can run from $255 for a Neu 1515(best) too $70 for a Feigao (entry level).
Esc you can go the tried and tested Mamba Max(MM)
http://www.rc-monster.com/proddetail..._MM_ESC&cat=21
Great for 4s Li-po also somewhat successful on 5s. With this one you will also need a UBEC of some kind like this one
http://www.rc-monster.com/proddetail...stlebec&cat=21
Or the better choice the Mamba Monster Max (MMM)
http://www.rc-monster.com/proddetail...steresc&cat=21
There are also some nice looking Esc/Motor combos coming from CastleCreations
http://www.castlecreations.com/produ...a_monster.html
supposed too see these end of the month,but who knows for sure.
Also you'll need some pinions
http://www.rc-monster.com/proddetail...1pinion&cat=40
size dependent on choice of setup.
The plastic Kyosho Spur
http://www.rc-monster.com/proddetail...YOIF148&cat=40
is also a good idea too reduce pinion wear but not necessary.
A good place to check out to configure your setup and play with some numbers
http://www.scriptasylum.com/rc_speed/_top_speed.html
Your diff ratio=4.3
spur =50
or if plastic =46
Another must read for Newbs is here
http://www.rc-monster.com/forum/showthread.php?t=5115
Any more Q's ask away,everyone is here to help