Well, it turns out I can't live without the BCM.
So I removed the unnecessary clock, hazard switch, temp display, and airbag light, to make the box smaller. Then I located it in front of the heater, under the radio. (Pics later). So now I've got my flashing dash lights under control. I still need to figure out a way to trick the 4x controller into thinking that the motor that engages the front axle is plugged in. I tried using a variable resistor, it worked for a second, but fried the resistor. It only needs 1 ohm of resistance to work, but the amps that burn through it are pretty tremendous compared to what most resistors are designed to take. Any suggestions? Oh yah, too many ohms and it doesn't work either! Any electronics gurus that can help?
I've also installed the headlights, and front body crossmember. That was an ordeal, because I had to cut the body where the inner headlight bolts to so that the rad would fit. Then I had to trim the body crossmember (the one that has the hood latch and connects the two fenders together) and had to chop the safety latch off of the hood latch because it was interfering with the radiator.
Also, hooked up the shifter cable, bled the brakes and took it for a short drive around the yard. It's gonna be a wild ride when it's done!