Joe, I've been inside the VL Gensets a few times, like you to replace batting in each of the 3 smoke units. The screws (10) you point out are correct for removal. Then lift the body off the frame but this can be tricky. This loco is chock full of boards and wiring. If memory serves me well, lift more on the nose some and slightly pull body towards rear during removal to clear the motor. You must take care at the inside rear where each antenna wires meets the handrail. This is soldered but with some high heat and tough to redo.
Once separated you will need to disconnect the antenna wire (wire nut). Also a harness jumps from the motherboard to the smoke unit board tucked up high in the body. This harness has little excess to give.
The smoke units seem buried below top of the body. Each one mounted slightly different and each with it's own harness.
Smoke units are sealed/gasketed with black RTV so lots of cleaning up the old before reassembly.
Take lots of pics along the way to get things routed back right.
Good luck. Ask if you get stuck.