Okieboy, the buttstock shape was derived from Kindig's TKR #257, by Peter White. I enlarged the pics on my copier to suite. A very low comb.
Triggers: I only had one example of White using dbl. set triggers and it didn't show if it was flint or perc. It did have the straighter rear trigger. Numerous Bedfords used the curved back one, especially Daniel Border, and I had built one of his before so I thought it would be acceptable. If iI have to flip a coin to choose I will take the set that has a sear bar on both triggers, not just the rear. Choices are limited. I could have straightened it but it didn't bother me and it fit the guard like it belonged.
Rat Tails: I don't buy the argument that flinters were all round tails. Look at the long slim lock mouldings ending in a leaf or teardrop on both his rifles in TKR. They are very typical to all the other rat tailed guns in the books. I think they would have been shaped much differently if originally round tailed.
Shreckmiester: In Whisker's book "Bedford County Gunsmiths and Gunmakers" there is a William Defibaugh rifle with a patchbox almost identical to the one you posted! I knew I had seen it somewhere