Here is the doner
I had to give it a quite some thought before I ended up with this button layout.
After some time I then placed my hand on the mouse and marked the spots that would be convenient for my thumb.
I cut the holes and tested how the buttons would fit..
I first thought about putting the switches on the buttons, but then I decided otherwise
Placement for switches...
At last, they are on the spot..
Then wires for the switches
I had some problems getting all the buttons to work, but it seems that it was a driver issue.
The USB cord makes a tight turn on the front of the mouse and it's a little hard to get it on its own space.