For over a year, I've been a happy owner of an Axis XP .223 ... but it's right-handed and I'd like to upgrade the caliber.

Ideally, I would like to get an Axis setup with the following,

1) Left-handed
2) 7mm-08 caliber
3) Stainless barrel
4) Boyds stock
5) Simple trigger mod

I can't seem to find the combination of lefty + 7mm-08 + stainless anywhere. So it looks like my starting point would be a lefty 7mm-08 with standard blued barrel and then change the stock + barrel.

Question: Does it make sense to buy a new/used rifle and change both stock + barrel? Is it possible to buy a sub-assembly without stock + barrel instead? If so, where?

I'm not a gunsmith, this would be my first custom rifle job. I'm inexperienced so I'm not considering starting "from scratch" (from individual parts) or anything like that. What are my options?