Well...the current "drop in" setup is for Glocks, which have a fairly conventional rear mount setup but a somewhat bizarre front mount...it's not a dovetail at all, it's a bolt-in-from-the-bottom affair. I'm talking here about the Glock design that the Hexsite has to match.
Pics make it obvious here:
http://www.goshen-hexsite.com/pistols.htm
The rear Hexsite aperture piece is the more complex bit. The most recent design is made of a high-tech plastic so hard and tough that when I first saw one and knocked it against my front tooth gently, I said to Tim "OK, so that's a metal one" - and I was wrong. That's the current Glock-kit production and what will be the basis for alh the other drop-in Hexsite kits down the road.
It's set up to fit on a separate, detachable stainless steel dovetail unit that the main hex aperture piece bolts down onto. The one shipping now is for Glocks but others are in the works...I think the XD is actually done, it's just a matter of ramping up production.
In addition to the hardware bits, Tim also has to get the front and rear sight heights dialed in for each gun type supported. On a custom basis he can do that in his shop but he's working as hard as he can to get regular production in place on a lot of guns.
Meanwhile, yeah, the Glock parts can be adapted to other guns yourself. One answer would be to take plain steel sights for the gun in question, bought cheap, and basically grind them flat until nothing is left but the dovetail bases. You would then drill holes up through the bottoms and screw the Glock part tops onto what's left of the old sights.
There's already a threaded screwhole up through the bottom of the Glock front sights to use as the connection between that and the modified original front sight milled down. And there's already a precision-centered hole in the hex rear aperture meant to bolt it down onto a dovetail like the one supplied for Glocks.
To get the front and rear sight heights correct, you would measure the current heights of sights that work on your gun now. This is what I did developing the "Hacksite": I took sights that were already dialed in, measured, and when I added the rear hex aperture I knew how much rear sight height I was adding between the top of the old rear sight to the MIDDLE of the new aperture...that was my "added rear height" number. I then added that same number to the original front sight height. I've kept those same measurements in use in the Hacksite Mk2, Mk3, Mk4 and now Mk5 and they've always worked.
Could the same process work with the Hexsite Glock parts kit? Yeah. You'd need a precision mill and drill on the old sights to turn them into bases for the Hexsite parts meant for a Glock, but yeah, it would work and I know Tim wouldn't be at all upset if people started homebrewing that. He's still getting paid for the Glock parts. But he can't provide support for that sort of effort because, well, he's not going to know how good you are with the mill'n'drill process.
(Note that the front sight height will be higher, esp. in a revolver where you can see it. On my Hacksite full-length tube, the fact that the tube isn't parallel to the barrel is obvious - that's what deals with recoil. By the time the bullet clears the muzzle after firing, the barrel rocks backwards to end up at a point that IS parallel to the tube I use! In a semi-auto the same thing is going on, but this "barrel points down a bit factor" is often hidden within the slide where it's not obvious.)
One more thing. 80% or more of the "magic" of this critter is at the rear. If you combine the Glock-kit hex rear aperture with a conventional plain black front sight for your gun (avoid fiber optic, tritium, dots, etc.) you'll have a very good system over. The Hexsite front is still slightly better if you can get it on there, as it's "blacker" when seen from the rear (dimples in shadow), is glint-resistant and has that small aiming notch in the top-center. But you can get started without all that, adapt the front later if you want. Those front sight elements do help; I added the aiming notch halfway through the Mk4 development cycle and it did shrink up groups and increase speed a bit.
Each time I altered my setup closer to Tim's overall recipe, it got better.