Winky your drawing looks perfect to me , you have the neutral connected straight to the chassis and your hot going through the switch to the tube's heater (via the dropping capacitor) and it's plate . The across the line cap C4 .05 MF is electrically identical in both it's originally drawn position on the schematic and where you drew it in with a question mark . Drawn either way , it's got one lead on the hot side and one lead on the neutral side , just as the circuit needs it .