Help creating a low budget Hyper 7 brushless

[DrKnow65]

Hi guys, been a while since I've been around the forum doing more than lite reading... But it's time to start playing again :-)

What I'm looking to do is throw togeather a new basher with my upcoming birthday budget, ~$450 USD.

What I have to work with is a Hyper 7 PBS that needs a little repair from a runaway incident of the fuelly days. Chassis is just bent enough to warrant replacing and the front driveshaft is tweaked too. Other than that the diffs, linkage and such is in good working order. Still have good radio, servos, ect to work with.

What I don't have yet is a MMM Esc and motor combo, lipo's, and what ever else it takes to convert to brushless.

I'm not a noob, but advise on the best budget items would be appreciated.
I am thinking 6s total with 2x3s 5000mah zippy lipo's and custom made CF trays. But it's spur gear/ motor mount where I'm stalled.

Was wondering if a tranny from the nexx8 electric would provide a cheap electric swap alternative?