Bob has a page about leaf switch buttons.
http://www.dameon.net/BBBB/leafsw.htmlAs far as mounting the joys, there's not a lot involved, at least on a metal panel. On a wood panel you might have to route the back some to mount the base, but there's not a lot of difference between mounting a leaf stick or a microswitch stick. Once it's mounted and you've used it a bit, you might have to adjust the leafswitches, but once that's done you should be good to go for quite awhile.