So it look like there are 2 stepper motor oscillators synced over the bearing pulse line.
Doesnt look very complex, 2 stepper osc's, magnetron and a rf amp.
I spose you need to add the current used by the display to the 1.5a of the scanner, which would probably be around 5a I was expecting.
My Ekco weather radar display has 1/2 a circle display, probably ahead only, the If is in the display unit, I didnt work out how the display worked, it has x/y deflection coils, I think the scanner generated quadrature signals which could just be amplified & applied to the coils, with the equiv of a Tv horizontal mixed in for the distance axis.
Funny how you regard some things as complicated, but when you get into it, they are not so bad, however if you were to start from scratch maybe it would be a marathon.