Hey Paul,
Thanks, I've been wondering if people are finding this info interesting or useful. I'm just getting started, lots more ideas to come if people are interested. I've got a huge stack of these magazines and almost every one has something in it that as a Jeep person I find interesting.
When companies like Bulldawg make molds, they usually make the window mounting surface flat so they can install flat glass (or RV-style windows or hatches). That's what Bulldawg has done so they can easily and affordably offer slider windows or cargo hatches. Unfortunately the TJ factory hardtop window mounting surface is curved in both directions, which means that simple solutions like installing an RV-style slider or hatch won't work, and either a curved window is necessary (expensive custom window frame/manufacturing tooling) or some sort of "adapter" (which I called a "retrofit kit" in my earlier post) is necessary which mounts to the curved window mounting surface and provides a flat mounting surface for an affordable window or hatch.
For the JK/JKU and JL/JLU the design of the hardtop allowed me to come up with a fairly simple laser-cut aluminum retrofit kit to allow inexpensive RV-style windows to be installed. Unfortunately due to the way the TJ/LJ window openings curve, an aluminum retrofit kit wouldn't be simple and would probably require custom tooling to produce.
The design I've done for the TJ and LJ uses a fiberglass retrofit kit, which is easy to make, even for a one-off project, but it would be more expensive to produce than the JK/JL retrofit kits. But I just don't think there would be enough demand - I mean, look at your decision Paul, you decided that for the reasonable upcharge the cargo windows would involve and the fact that it would come installed from the factory it still wouldn't be worthwhile for you to have them (I'm not criticizing you, just using you as an example of someone for whom having cargo windows would be easy and you decided it wasn't worth it).