It's up to you, of course, but it'll take a lot of money to put into a 70+ year old action, versus rebarrelling a commercial rifle with all the extras and doodads already stock items.
It would make a nice classic-styled sporter, but so do a lot of the usual suspects, for less money, trouble, and time.
I'd probably shop around, find a used Vanguard or something, and have it rebarrelled. No panache, of course, but the goodies you'd pay to have put on the 03A3, are already there, and possibly better engineered.
Then again, I'm a tightwad.
