You sure you want to buy from GON?
Just generally there are many many options out there for 60% pcb.
As for the case, I think they are not going to restock any soon. Btw, someone is selling a Lambo 60% case in MMKB fb page. And not to mention lots of option in taobao.
Switches, maybe just swap out the blues with a lighter spring? Blues are by no means heavy to me though, I don't like red, too light for me.
Usually USB and controllers are presoldered or if there is an option, please let them solder for you. You sure you can assemble yourself and not burn the pcb?
Malaysia I think is harder to find anyone selling RF as new or used, they are pretty rare here. Maybe try buying from Japan, ebay and etc.