You know the saying, "More than one way to skin a Cat."
Lots of ways to do what you are going to do. What you
have stated is good. Keep in mind that different is not
bad. It's just different.
If you have not ordered the DA50 yet, I suggest you order
the MSC 23 by 8 prop, along with the DA50, if you are getting
the motor from DA. That prop did excellent as a break-in prop.
At 28% in size, 17 or so lbs (with c/f gear, wing and stab tubes)
and 7 servos to drive, you have battery options open to you.
Try to keep it simple. I use three Nickel Metals. No regulators,
no match boxes as when you go to LiPos or LiOns..
Read thru the different threads here. You'll find answers to
questions you haven't thought of yet..
Gerald