Converting a Savage X to BL; easy?

[V0RT3X]

Instead of saving up for a flux and risking my mother killing me for spending more money on RC, I came over an idea of doing a conversion. (more fun)

A guy is selling a Savage X 4.1 truck for 130 euros, I'd dump the motor and slowly start putting stuff together. What kind of investment would I be looking at?

BL system
new diffs
motor and esc mount and other minor stuff

Anything else? I already have the batteries and other electric things from my brushless E-Revo.

Can you buy all the parts or are there things that you must do by yourself?

Does it come out cheaper than a flux at the end?