Original Yugo barrels with decent bores show up for sale sometimes - they are one of the more common and obtainable original factory barrels. And there are several people offering very nice saw-cut original Yugo M70 milled receivers on the AK Files Trader Forum.
If I were going to build up a Yugo milled receiver M70, a rewelded original receiver and original barrel would be the only way to go.....anything less is just a waste of time like pissing into the wind while doing a hand-stand in a mud puddle.
There are a few talented folks who can do a first class job of rewelding a cut original receiver. Given this option, I can't see using even the best of the U.S. made receivers.
The rifle below is one I recently acquired that was restored from a number-matching original barrel kit several years ago. (The photos were taken at one of my other houses in a neighboring free state, where I am free to enjoy the rifles in my collection as God and Mikhail Kalashnikov intended for them to be)
When you factor in the cost of a nice kit, a clean shootable original barrel, and an original receiver + reweld, it does add up, but this is one of those things that are definitely worth doing right - "half-ass" is for Democrats and government workers.