Thanks for the feedback. To address some of the questions:
ABS-sorry for the confusion. They're all steel construction, the piece of 1.25" ABS pipe happened to be about the radius I needed to bend the steel around to form the one corner to the curve of the tailgate.
The projector fogs are incandecent, not LEDs, 55w a piece, so they're somewhat brighter than the stock lenses. I used what I had kicking around which happened to be these cheepos. The beam turned out to be wide and focused a little flatter than I had been hoping for, but they sure light it up behind me. There's not a whole lot of room there, otherwise a pair of 3" or 4" floods would have been my first choice. I'm sure there's other lights out there that would do an even better job.
Flasher- Putting in the LEDs made my stock flasher go crazy. I simply replaced it with an EP27 electronic flasher and all is just fine.
Earlier years- I looked at my buddy's 87 today and these probably will look terrible on it, unless I change the design to follow the older body lines. Stay tuned...
Plug & Play- Not. Not yet at least. I was getting excited about the lights and didn't feel like taking the time to pull the interior apart to get back to the wiring harness, so I just chopped, soldered, liquid taped and heat shrunk. A lot of work to be sure, but I wanted to play around a bit with different wirings, and this allowed me to test various ways out. I'm sure I can come up with harnesses that just plug into the stock connector.
Sealing- The boxes themselves are quite open. In my experience with rain and water (and out here (BC) we get plenty of opportunity to test), water is going to get in, you better provide good means for it to get out. The LED light units themselves are sealed units, and use a somewhat standard type of grease filled connector which seals up good enough for immersion (like on a boat trailer). These are what they use on commercial trailers which are all open in behind and get caked with all manner of grime, mud and various liquids.
In my case, I cut the bulbs off, and didn't remove or tamper with the stock grommet/seal where the wires came out of the body. Therefore, the integrety is as good as the stock installation was.
Side lighting- I was concerned with this when I designed the lights and did a couple things on account of this. I really didn't want a light on the side because where I wheel, you're taking a lot of brush down the side of the vehicle, that's what took out my stock light in the first place.
The actual LED light units themselves which I used stick out the back a fair bit. The bulk of the body is countersunk, but the actual lens sticks out by a good 1/2" in the case of the red stop/park lights, and around 1/4" to 3/8" for the yellow signal. To keep these protected I set them back into the body, and angled them about 15 degrees outboard. Between the amount that they protrude from flush, and the amount that they're angled, They are fairly visable from 90 degrees. If I were to make more of these, I would increase the angle to make them even more visable from the side. I haven't check the motor vehicle regs for specs on this, but in a practical sense, at the very least the intent of the law is fulfilled. If they're going to get really sticky, a reflector could probably be taken care of with a piece conspicuosity tape, I'm guessing. A stick on reflector could be put on, but wouldn't last for me, and both would look retarded, imho.
As for the price, I'm not sure I could do it for $150. The lights themselves came to about that in canadian dollars. If I can get lights for wholesale, I might be able to make something work.
Any more questions? Keep the feedback coming.