Looks like you're definitely on the right track. Couple of things to maybe consider:

A Shilen is a great barrel, A CBI could be every bit as accurate and may be in stock with Jim, I wouldn't pick one above the other. 26" is a pretty standard aftermarket length, there seems to be a lot of folks having really good results with 24-22" barrels as well, may be something to look at.

The Vortex PSTs are awesome scopes, I have a couple of them and couldn't be happier. The EBR-1 reticle is awesome.

You didn't mention barrel twist, or whether you hand load, those can be pretty big considerations.

darkker is right, trigger pull/weight can really throw off a good build, your donor is an accutrigger?

What is your history/skill level?

Should be a great project, be sure to keep us posted!