Played around seeing if I could use the stock door check strap with the bar going into the A pillar instead of the door, to aviod the one piece windows, but just couldn't get it to work that way. So I'm going the same way as many Jeeps have. Going to start by welding this heavier gauge angle inside the door and A pillar where mounts will be fixed.
Angle plug welded into position inside the door. This is just to make sure the screws don't get pulled through should the door be caught by a gust of wind or let go when parked on a side slope!
Ground down the welds and pilot holes drilled.
Bought some stainless steel footman loops and using an old leather belt for mock up.
These a often called Chicago Rivets or Screw Backs. I got nickel plated brass ones with a 8mm-5/16" head diameter. They just screw into themselves making riveting leather easy. Strap can be wrapped around a bar for instance that is already welded into place.
I have got it on back to front to make it easier to work out the length I need to make the strap.
Works really well and this mock up strap will work as a template for when it is time to do upholstery.
I'm actually trying to find another one of these belts that I used to have to make the strap from in the final version. Can't seem to find them anymore so if someone stops one, please let me know. The only belts I can find with Jeep stamped on them now have it only once at the very end with the belt holes too close to use it.