CraigC, beautiful work...stitching is excellent, like the stamp pattern, and the dye job is a perfect compliment to the stocks. Good work there!
I too like the Tom Threepersons types, and have made them almost exclusively for the past 30 years or so...friends, family, gifts...there are probably a cpl dozen at least. I agree that a well fitted, wet formed Threepersons needs no strap or thong. I've put them on when the recipient insisted by don't really think they're necessary.
One note on a true Threepersons holster...they were stitched closed at the muzzle to my understanding, at least the ones featured by El Paso Saddlery...a design feature that I don't like...In my versions, I've left the muzzle open to allow dust, dirt, twigs, water and snow to pass on through, as I think a closed muzzle just collects all that stuff that's not good for the gun!
As to lining....I'd opine that any lining holds dirt that's abrasive to the gun's finish, just as much as an unlined holster. For the vast majority of the rigs I've built, and my sons as well, we've not lined them. For the most part we've done rough side inside, but have experimented with smooth side in with the rough exposed. It makes up into an odd looking holster, but only I think because you seldom see them. One advantage to the rough side out is that they stay where they're supposed to, the rough leather sticking to some extent to your jeans.
My favorite rig is a self made copy of John Wayne's money belt/holster worn in many of his movies. It's by far the most comfortable gun belt I've ever tried. The belt itself is sewn rough side out, double thickness of 6-7 oz. tooling leather. The belt contours to your body dimensions, sticks to your jeans and doesn't ride up in wear. The one I made up has no loops, but I've made up a number of slide on carriers in several calibers to tote extra rounds. The 12 round models work out best and are not too heavy to carry.
Here are a cpl pics, one with the rough out JW money belt with a Tom Threepersons toting a baby Vaquero in .32 H&R. The pic has a bluish cast to it, tho the holster is closer to the 2nd picture in color...the belt is not as pale either, and will wear to a nice patina over the years. The slide is for .357 rounds and slips over the money belt.
The other is a 2-1/2" full thickness gun belt with one of my .44 Specials in a Threepersons. The belt sports a buckle from a 1918 McClellan Saddle stirrup leather, and a knife made up by #1 son. His brother made the belt, I did the holster...a true family project. The belt was made in Afghanistan where #2 son was stationed at the time...and Tandy would send him leather and tools at cost...a good GI friendly firm there...
HTH's Rod