I'll agree the b5 is the way to go IMO. There are a couple vids on youtube on how to install. The b5 vid is with a tele but you just skip over the bridge installation and start with the bigsby install.
I used that vid when I installed one on my old melody maker. It's pretty simple. Find the spot where the trem arm meets where you tend to strum; that will help you evaluate the best spot for ease of use. Make sure your alignment from bigsby to bridge to nut is straight with the string supplied. Measure 3 times and drill once. It's always a good idea to have a separate pair of trusted eyes and hands to help you out too.
Good luck. It's a cool mod.