you got a breakdown of cost? i must know, doesn't have to be TOO specific 
My costs are no where near realistic compared to what an average person would pay. I got hookups on the major items, and my bill was around $2500. Expect to pay $4k+ for all the same items.
do you have a wiring chart you wouldnt mind posting?
Here is what mine is wired by.
Easiest way to identify what connector goes to what sensor is to pull back the connectors rubber boot and observe the colors and label the connector. Repeat until all are labeled...
oil pressure sensor  BRN/GRN or BRN/GRY 
front coolant temperature sensor (ECU)  BRN/RED BRN 
rear coolant temperature sensor (Gauge Sensor) BRN/YEL BRN/VIO 
crank position sensor YEL 
cam position sensor YEL RED/WHT BRN/ORG 
VANOS solenoid RED/WHT GRN/BLU 
knock sensor, 1-3 BLK NCA DME PIN 70 
knock sensor, 4-6 BLK NCA DME PIN 69 
throttle position sensor (TPS) BRN BRN/BLK RED/YEL 
intake air temperature (IAT) sensor BRN GRY 
idle control valve (ICV) WHT/YEL RED/WHT WHT/GRN 
Evaporative emissions valve BRN RED/WHT
As far as the engine wiring harness you are going to want to cut all the unnecessary bulk from the harness so you can jam pack whats left under the m42 harness cover on the wire wall.
As for the C101 connector wiring, grab the e36's equivalent connector the x20, and cut it off about 6 inches back from the x20 connector. Cut the hard plastic sheath off entirely as it will make it a bitch to pack the wires under the m42 cover.
Using this chart as a guide strip back all wires that will be reused and then tie back and tape off the several that won't.

Purchase 16-20 male wiring connectors from your local dealer, part number 61-13-1-376-191. 16 being how many you need, and 20 allowing for mistakes like accidental crushing or something.
Crimp and solder one connector on each of the wires you've identified from above. (shown here spread for soldering)

Once the soldering is done and cooled insert all the new pins into a spare engine harness side e30 c101 connector in the right pin holes as listed in the chart above.
Plug the new C101 directly into your e30's main harness.