OK, got the knob off. Just to follow up with the answer in case someone searches and ends up here down the road.
The knob is a simple screw-on. It is the knob itself, on top of a threaded axle that drives the spool winding tab. Counter-clockwise rotation to remove. I suggest pliers on the wind knob tab inside the body while unscrewing the top knob to avoid excessive pressure on the frame metering system.
My knob was obviously stuck hard. I think it was corrosion. Inside the camera, many parts have a strange light green and tan coating, maybe an anodizing or "anti-corrosion coating" (ha!) that appears to be corrosion of some sort. Many screws were very hard to remove for cleaning mechanisms because of this corrosion, and a few pivot points needed to be polished clean to actually pivot again.
I heated up the wind axle using a small blowtorch on the inside of the camera. Heating up the wind tab area a few times, the last time pretty thoroughly, was what was needed to break the joint between the axle and the wind knob.
There are four screws around the bottom outside of the top cover that need to be removed. And the rear eyepiece is threaded into the main prism block and needs to be removed. With these all gone- wind knob, rear eyepiece, and 4 screws- the top cover lifts off. The wind release button and the shutter release button have NO role in getting the top off.
FYI, the red rangefinder window filter is a small piece of red tinted glass. I removed it because it makes the rangefinder image dark and red. It'd be nice to make it light yellow for contrast with the light blue tint of the main viewfinder image, but I don't have any material like that right now. So I just glued a piece of acetate in place as a dust cover. Both front glass pieces, over the rangefinder window and the viewfinder window, are simple dust covers, no optical functions.
The rest of the mechanism is pretty basic and should be easily sussed out by anyone willing to go inside.
Good luck!