Wouldn't a GON-style board be a huge pain to put on a filco? The plate that the switches are held in in one of GON's boards is the top of the case, so you would either (1) make it somehow fit the stock filco plate or (2) desolder all of the switches, at which point you're basically making a custom keyboard, except reusing the filco PCB (and you cant program it etc.)
Also, a fully-SS case would be amazing.