you need level 8 for closed loop lambda, and coil-pack conversion is personal choice i don't have it at the moment and i'm getting no issues, but saying that i have removed and stripped my loom and made sure it 100% before i refitted it.
(I am converting to coil-pack just as fund allow)

the great thing is you can always add the coilpack conversion at a later date once your car is up and running

so all you need is a 4x4 TPS, L8 ECU, Injectors (55lb or 83lb) and no doubt STU can do you an off the shelf chip for your car without the expense of a Live-Map

And if you got the money either buy a good used 4x4 loom or a new motorsport loom with all the item you want already wired in