JamesCannon, correct me if I misunderstood you, but it sounds like you are satisfied with Tung Oil as a topcoat, and are only saying that you believe you should stain the wood before applying the Tung Oil to get the look you want. Is this right?
If this is the case, Minwax Rub-On Poly isn't necessary, just some kind of a stain, followed by Tung Oil.
When I refinished my SKS stock I used Minwax Red Mahogany stain followed by a brush-on polyurethane, and it came out looking very, very similar to the original Russian finish (red, glossy lacquer). ACE store brand Red Mahogany is far, far too brown; I used it on a chair and putting it side by side with the Minwax, the Minwax is way better, way redder, and looks much more like an original SKS stock color. I felt a little bad refinishing an original Russian SKS from 1950, but it was looking pretty beat up and now it looks great. I feel a little guilty when I think about it, but then when I actually hold it I think, "Damn, this looks good."
I use Tung Oil regularly on wooden furniture I've made (nothing fancy, just shelves made from dimension lumber, wood glue, and nails) and it can look really, really nice, without any stain or anything, but it's entirely dependent on the color and figure of the wood. Redwood looks awesome, pine is kind of meh.
I don't know if red is the color you want, I was just sharing my personal experience in case it provides any insight.