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You could buy a stand alone harness already completed, but it cost less than $20 to make your own.

Super super super easy to make them run stand alone. I simply take the stock engine harness out of the donor truck, remove all the wires that are not needed for a stand alone setup, and build my own fuse box. Usually I run 4 fuses, and two relays. Super easy to do, with all the info ever needed...

That be super easy to do. The TH400 will bolt right up to the 5.3. The only thing required to mate the two is a adaptor that bolts to the flexplate, to help support the snout of the torque converter. Going with the older trans means you can keep the stock driveshafts, which is nice.

Should be easy enough. You could also get a universal motor made for a hotrod. A lot of them use a motor mounted to the windshield frame, and come in a variety of sizes. Might as well put a sail on it too.

I haven't done the swap on a Humvee yet, I'm just supplying info on the swap itself. If I had to guess, you could rob the wiper motor out of a H1?

Just switch everything over to conventional 12v stuff. For the LS swaps I've done, I always use a Walbro fuel pump mounted to the frame rail, with a Corvette style fuel pressure regulator. This sets the fuel pressure to the correct PSI, and also eliminates the need for a return line at the fuel...

I was gonna suggest an LS, but I figured OP wanted to stay diesel. If gas is an option, an LS is the way to go. Get one cheap, and bolt it in. You can use the engine mounts for a 350 powered H1, with LS adaptors. You could also keep the factory TH400, or switch to a 4L60E/4L80E. If you could...

You can put anything you want in it, if you have a grinder, welder, and a big enough hammer! I'd say go for it! The IDI is a good engine, and certainly is a workhorse as stated above. I'm sure you'll get the purists all worked up in the process, which in and of itself will be worth it lol