That's a tall order
I am not sure what it is you want to keep from/in the car and such. If you want to keep all the other P38 parts in place, such as the engine with it's ECU etc. then there is not a lot you can cut out actually. the BECM, as you may or may not know runs everything in the car. The cauge cluster, the windows, the lights, the horn, well. everything. also, the ECU must talk to the BECM because of the anti-theft system. If you really want just a running chassis which is never going to have any of the old functionality (that is including horn and lights and so on) then you could theoratically pull all that wiring out, remove the outdoor stations (since they are in the body they will be gone anyway) and remove all the cabling to them, all the way from the BECM plugs. I am sure the dash will throw heaps of errors but it should not affect the engine. Also, the ABS/ETC, EAS, cruise control and a few other things are run through the BECM which can be removed but might need fooling (see below). Having no ABS/ETC will throw your dash into a christmas tree but last time I had problems with the system, it did not affect the car in any other way.
The climate control can be fully removed including all it's cabling as well.
What you can't remove is the BECM itself, the ECU, the autobox computer (including it's connection to the becm), also do not remove the sensors! When and if you remove the EAS the suspension will stop working but you could manually inflate the airbags to a preset height. If you go for springs then you don't need it at all but remove the EAS requires a removal kit to fool the EAS computer. The low range controller needs to stay as well including it's connections/wires. unless you do not want to use low range that is.
Mind you that the P38 measures everything so you will get constant door, rear, front whatever open errors and such so you would need to fool all those sensor readings for the becm or the dash will just not shut up.
So, if your goal is to use a P38 as platform for some go cart, I would really just put in a megasquirt and be done with it (and figure something out for the dash cluster) because altering all this is a helluva job If you have other plans, please let us know and I am sure we can think along.
Cheers,
-P
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