I keep meaning to take pictures, but I haven't gotten around to it yet.

sorry.
But, here's a rough explanation of how I mounted mine:
I found some nice nylon hose at homedepot that was roughly the right size, just a tad on the large size as far as the diameter was concerned, but close enough and thick enough that I had no trouble getting the buttons nut to hold it on nice and secure.
This 'nylon hose' (I'm fairly certain it's nylon anyway) is like a semi-maliable clear plastic tube/water hose that I used my PVC cutters to cut into rings.
Then I drilled two holes on opposite sides (mostly opposite) and just set the LED's directly into it.
It wasn't a perfect solution, but it was very easy to work with /drill/cut, etc. and it held the LED's great, nice natural grip between it and the bulbs, and it was really cheap.
The more professional solution of course is to use those GGG pre-mounted, pre-soldered LED boards, etc that just go straight onto the button, but I'm not into those because they mount the led up underneath the center and are aimed straight up. I prefer the HAPP translucent buttons and with the LED's shining straight up them, they'll burn out your retina pretty good.

I light the lighting I got by using two LED's coming in from the sides and then just refracting/reflecting all through the button. This avoided any sort of whiteness or hot spots in the center of the buttons, etc.
Again, it's all a matter of opinion.
No matter how you end up doing it, it's gonna be quite the fun task to get all that soldering done!!! I remember doing mine, and I swore I'd never do one again without someone willing to pay me some serious money!