Your parts list looks good. I would suggest this about the stock. If you really want a Manners, get a Manners. Don't 'settle' for an AG. Not saying an AG isn't a good stock. I have an AG Alpine Hunter and it's nice but if it's not what you want, you won't be happy and will probably sell the whole rifle or at least change the stock later. The old buy once, cry once adage. Keep your eye on the classified section here. I've seen several MCS-PHs listed.
The TT Special is a nice trigger but get the Diamond. I've noticed that I have adjusted my trigger pull lighter over the last couple of years. It sounds scary at first to have a trigger set to 1 pound but it is really nice after you get used to it.
Go with the Hawkins Hunter DBM for bottom metal if you want a mag. You won't get as many rounds but it's pretty flush with the bottom of the stock. Honestly, I've never taken more than 2 shots at an animal so 3+1 is plenty. If you don't like it, you can always install a Hawkins M5 DBM or Oberndorf later.
My suggestions are only a couple of hundred dollars more at the beginning of your project but would add up if you start replacing things after the rifle is built. Good luck with your build!