YAIQ - Yet Another Immobilizer Question

[BOOTLEG]

I did not see any comments on relocating the immobilizer on the engine wall in back of the driver seat. My '01 S is a victim of the wet immobilizer and a locked up overheated engine. I bought a replacement engine with its' immobilizer, ignition, keys, DME etc. and getting ready to install it. After watching the waterproof box video, I decided against that and now considering just putting my new one behind the seat. So, for anyone who did this, did you just cut and solder in new wires or did you find a connector set? Any surprises or other "gotchas" in the process?