Well, I’d say by waiting, you now have access to better information online, support sites like this, and more and better pictures of original and current rifles. So I’m certain by waiting 40 years, you have built a much better rifle than you would have 4 decades ago!
I used to think my uncles gun built back in the late 70’s was the bomb when I was 17. When I saw it again about 5 years ago, I recognized some architectural issues that really stand out now. And now it’s really just an old gun from the 70’s with some mis-shappen free lanced stock geometry, (Since most didn’t have access to good information at the time, and didn’t know any better). Probably worth the cost of parts.
So yours is a mile ahead of where it would likely have been, and probably worth much more than a 40 year old version. Your gift to yourself for waiting!