I am also doing almost the same thing. I sent my Howa to Mcgowen and am having it re barreled 280AI in a Shilen #2 1:9 twist 24", squared/lapped. I already have a Timney trigger and Medalist. It wasn't designed to be a lite weight though and should come in around 8.5 w/scope. This action is blued and the barrel is CM, so, I'm going to Cerakote it myself (I'll let ya know how that goes
For a lite-weight rifle: I'm rebarreling my Rem m 7 and keeping it 7mm-08. Barrel will be Shilen #1 in 24 CM 1:9. (I'm building this riffle specifically for the Accubond 150 LR). I'm going to add a Timney, and Kevlar 24oz stock or go all out on the 12oz Stock (?). I'm going to convert it to an ADL to loose the bottom medal or find an aluminum replacement. The Bases and rings are already Aluminum. I 'm still deciding on glass. I'm also going to Cerakote it.
My steps: 1. What ya going to shoot with it? Targets, coyotes, deer elk. 2. Choose the caliber. 3. Choose the bullet ie. Heavy or light 4. Choose the twist (talk with whoever is rebarreling it) 5. Choose the weight of rifle and barrel length(stand hunting you can use a heavy/long rifle, stalking you can use a medium rifle, back packing=light). 6. Send the barreled action to your gunsmith (have him square everything and lap the lugs, flute if your going to, etc) 7. Choose the stock-I bed my own...its easy and there's plenty of videos) 8. Choose rings/bases, bottom medal, scope. 8. Cerakote or bead blast or blue, etc. Again, I'm going to try to Cerakote it myself.
Personally, I like going in steps and feeling the changes as it progresses. No need to add change rings/base at first, or even change the scope or stock initially.
I don't anticipate getting the Howa back until June and I haven't even sent the Rem in yet. So, I guess I'm saying there isn't a thing wrong with doing it a step at a time and adding stuff as you go. Go for it! and keep us posted.