Very nice job John ! ! !
You could replace the switch box with a weather proof toggle switch...
Or get a repro of the pull-chain switch available from Wayne's Neon Clocks, here's a photo:
Cleveland Pull-Chain SwitchThe neon clock I purchased a few months back has one installed; looks/function great!
Just last month, I received my mounting bracket from Wayne's Clocks and have the clock hanging on the back patio.