I can't tell from the pic if the side of the flat has a "scaly" appearance to it, or if it's just "camera stuff". I'm assuming you did not apply any gun oil on it yet. Application of oil to prevent further rusting will give it a different look.
For the sights....I don't know how to get a "brown" or "darkened" look with heat and bluing. I replaced my front sight with just a brass blade, and I removed my Lyman Peep and put back on just a standard metal "V" sight. I cut the rear sight dovetail using a hacksaw and files. If you go that route just don't cut too deep with the hacksaw blades Shallow cuts will remove the metal faster than just a file.
For the RR tubes I tossed the original T\C's and went with steel one's from TOTW. You can brown those to match easily. You will have to drill the steel ones so you can put the tubes in via the T\C RR screws. But that's not too tough of a job.
Good work!! Your T\C won't look like the run-of-the-mill ones anymore!!
Here's a few pics of my re-do. The brass parts I blackened, and just a pic of the replacement RR tubes. The sights in the pic were removed later and replaced with brass blade front and V rear.