So my Alien Gear shell for the Colt 1903 came in and I mounted it on the paddle holster base. After just some slight adjustments I think I have it dialed in. I'll give it a try over the long weekend and see how it does. I think my 1920 Colt 1903 Type III that was Parkerized professionally at some time in its past will be the first but I'll likely also check to see if it will work with my Type I that has the 4" instead of 3.75" barrel.
and the 4":
and the 4":