Much thanks!
For the purpose of completeness, here's a summary of my project. It's quite evident from the pictures (except the details of the stock splice).
I bought a used stock from an M-1938 from Numrich. I cut the stock of the TOZ-78 behind the sling swivel and cut the M44 stock 2" behind the rearmost barrel band. I spliced the pieces together using two 3/4 inch lengths of poplar 3/16 dowel in drilled holes. There is enough space to do this if you cut the M44 stock where there is some "meat". The spliced piece was glued (Gorilla Glue) and sanded down to match the TOZ stock. The TOZ stock was modified into a straight wrist with no checkering, indentations in the forestock, and modified for a Mosin-Nagant buttplate. There was a slot cut for the dog-collar sling.
This overall setup allows the barrel to float but gives the gun a nice mannlicher stock and handguard.
I gave the stock a dark stain to blend the stock splice and 3 coats of red shellac (like a real nagant!).
I ended up using two front barrel bands instead of a front and a rear one. This was because there is nothing to hold the handguard from sliding back and so you need that extra tightness for a friction hold so that the handguard stays solidly put. I had to bend out the rear barrrel band a bit but it fits perfect now.