There's one major problem with revolver "parts kits":
Unlike automatic pistols, almost ALL revolver parts are individually fitted to the frame at the factory.
There are virtually NO "drop in" revolver parts.
Critical parts like the barrel and especially the cylinder assembly WILL NOT fit another frame properly.
While you will occasionally get a cylinder assembly to "appear" to drop in, in fact I've never seen a drop in that actually fitted properly in all respects.
When the factory fits a new cylinder to a revolver, it's done as an assembly of the cylinder and an ejector that's been fitted to THAT cylinder.
The new assembly is then individually fitted to the frame, insuring that head space, end shake, barrel/cylinder gap, timing, and chamber/bore alignment is adjusted to specs.
Again, I've never seen a "drop in" cylinder that was properly fitted for all the above, and ALL the above are absolutely critical.
The second problem with revolver parts kits is finding a frame.
Most usable frames are already assembled into working revolvers.
A third problem is, revolvers go through changes, noted by the S&W "dash" code indicating engineering changes to the gun.
You have to have a parts set that's fully compatible with the frame.
Remember, modern revolvers are "machine fitted" at the factory. Once fitted, most parts cannot be re-fitted, they are intended to be simply replaced with a factory new part.
Bottom line: While it's "possible" to assembly a properly working revolver from one of these kits, it takes a really qualified pistolsmith to do it, and he'll almost always require replacing some of the parts that simply won't work.
Finally, even if you find a good frame and could get a parts kit together properly, the cost will be more than a new revolver.