to be honest you seem to have some cash, why not just build it
d series motors are cheap, i wouldnt be too scare of breaking s**t if you have a good bit of cash, cant be scared your whole life
now for me and the gsr i bought it all at once, but also blowing up a c1 isnt the same as a d series motor
and you only need a 3 bar map sensor if you go over 11.5lbs