You know of cmsnl for the exploded views which may help.
Most carb fuel levels can be "seen" via the plastic tube and drain screw method, some even using the fuel level shown relative to a reference point, usually the line made by the float bowl to carb body joint. Twins etc, can easily be compared this way.
Have you made a float gauge ?
Without checking, your carbs have the float chamber wire clamp or screws ?
I tend to replace the screws with allen bolts these days, makes removing the chambers easy with the carbs in situ, for servicing and cleaning etc..