yeah they get pretty bloody big alright, air temp sensor depends on your ECU, I'm running an OEM commodore ECU so I just have the air temp sensor zip tied to the front cross brace on the ITB's. as long as its in the air stream somewhere close its ok,
fuel pressure is set to injector type and forget, no need for any connectivity to ECU.
exhaust gas sensors, unless your going to run a self tuning closed loop type ECU, no. most only operate in idle anyway.
axles are getting made in New Plymouth as we speak, so it should be driveable by the end of the month. then panel and paint .
cheers John