Expensive lesson to learn: "Custom" rifle builds are generally bull$hit and simply a good way to hemorrhage cash. Modern rifles like Tikka are like Legos - put the pieces together yourself so you learn and save big time.
6.5 Creed is the perfect one gun. Call up Jake at EuroOptic and get the cheapest stainless Tikka they offer. Get a vertical grip and cheek riser and go to town. Save up for an aftermarket stock once you realize what you want. Grab a used Maven RS 1.2 from here - there's going to be a lot dumped on the market now that the S2H scopes are coming out. Sportsmatch T084 rings. Buy a good value suppressor (Airlock or UM seem to be solid choices these days). Have a local gunsmith chop and thread the barrel to your desired length (will need an adapter to go 5/8x24 most likely but that's fine).
Start shooting and familiarizing yourself on how to properly set up a stock Tikka before spending money blindly only to realize you wish you had done something different.