Hmmm. Interesting. I'm pretty sure this is the same H3 I saw on eBay last year...looks like the same twin-stick console mod. Just like 07custom's solid axle rig...it probably just needs somebody to un-screw the screwed-up stuff. I don't see the reason for disabling the airbags. I also don't understand why the ABS is disabled. Both of these should work fine. The TCS is another story. Its obviously not going to work without the stock T-case but, that shouldn't effect the ABS or the airbags.
Seems like you should be able to un-plug the stock T-case, and put some jumper wires (possibly with a diode or resistor) onto the open T-case plug. The idea would be to "fake" the puter into thinking everything is always good...all the time. Then push the stock "4HI-street" button and leave it be. From that point on, you would control the t-case via the levers. The only issue might be in low range, when the puter tries to disable all the stock electronic goodies and re-calibrates the speedo...that would not work. But does anybody really look at the speedo in low range? (I don't).
Now that I think about it...TCS would activate if you were in 2WD and spinning the rear tires (at a different speed from the front ones). So maybe thats why the ABS was disabled. Who knows. Anyway...looks like a nice truck and I would love to have it myself. It would work good with some CUCV 8-lug axles! I'm not crazy about a super-charged motor but, its already in there...so why not!