It's difficult to 'build' a revolver from the stripped bbl'd frame when looking at it strictly from the $$ standpoint.
You've already seen that individual parts add up quickly. Buying a parts kit,,basicly everything but the frame, from another revolver is one way to get what you need.
But then the labor enters the picture.

Doing it yourself and for the fun of it,,it's a project and we don't keep a clock on it. If we did, we'd find most times we'd be working for a few $$ an hr when the final product is done and you put a market price on it. The first thing you'll hear is..'Well I could buy a nice condition Real One for xx$, so your mongrel made from parts gun is only worth -xx$.

If you're going to hire out the labor, it really gets to be upside-down in value. You just aren't creating anything special with that investment.

You could pull the bbl and sell that separate. The M19-2 , 4inch Bbl itself would bring pretty good money.
The frame itself being a magnum, adj sight frame, would sell to either a project tinkerer (make a wildcat caliber revolver, make a revolving carbine, ect), maybe someone with a M19 with a damaged frame that wants to replace it, or even a stock/grip maker,,they use the frames to fit grips and hold them while working on them.
The sideplate being missing is a big deal to most but to someone who is going to rebuild the whole thing, refinish, ect, not so much.
A stock/grip maker can use it as-is but I would probably just screw on a K frame plate just to cover the sharp edges while working.

Just some thoughts from someone who's been there.