After reading all the posts that discuss the Tikka barrel threads being TPI and not metric as the 'smith claimed, I have to wonder if that guy really IS a decent 'smith or if he really HAS rebarreled one of those rifles.
Sounds to me to be a marginally-experienced 'smith that is over-selling his work time, padding the job/hours to ensure he has enough time to actually complete the job.
And literally destroying your old barrel to remove it?!? That's unconscionable unless someone spot welded the original barrel to the action which would be unheard of IMHO. But that's just me.
As a minimum I'd be asking a LOT of shooters in the area and googling that 'smith to see if there are any bad reports of him, and not just for his cost per job.
And as others have already said, the job shouldn't cost what he is asking UNLESS that takes into account the price of the replacement barrel.
Even then, ruining your original barrel to remove it?
Hmm.
Me thinks I'd be looking elsewhere but YMMV.
Good Luck and keep us posted on the outcome and ultimate resolution WRT how that Sweetheart gun shoots.