For comparison, here's a view of the power transformer in my US GE 810 . . . much smaller!
I see that you are also missing the metal rear cover for the HV cage. I guess I'll make a new one from sheet aluminum. It appears to be fastened with a single screw at the cage top. Apparently the HV cage has no cover on the other (front) end -- at least, I see no means to attach one.
Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html