Right now I'm envisisioning you and your "gunsmith" sharing a large bowl of paint chips as I try to fathom why anyone would choose a Tikka as the basis of a custom build. Tikka custom= oxy moron. Moron.
You could not possibly start with less. What part of the rifle would you save? "Here is my custom build, based on a Tikka T3 trigger".
Half the rifle is made by the Lego Divsion of Playskool, as subcontracted by Fisher Price.
Do you even know wtf a blue printed action is?
And there is a reason why the T3 receiver is "enclosed" . Care to take a crack at it, Mr. Tight Tolerances?
You are way over your head here. And started $hit with the wrong guy......