Great project! You’re spot-on with this platform. Honestly I wouldn’t get buried in the weeds about the chambering as she can always swap barrels at a later date.I am wanting to build (or put together) a rifle with my young deer hunting daughter, something that she could look back at in 40 yrs and say "I built that with my daddy".
I was thinking of the following,
Savage rifle
barrel swap(just for the experience)
light recoiling caliber
aftermarket trigger
Boyds stock
lapping of scope rings
any suggestions or tips would be appreciated, oh yes, low cost is good