I finally got to replace my IBM model F foam mat! (Thanks Chris)
After a few setbacks I managed to close is all (don't try to close it while the keys are on...)
I used a new layout (see picture below). Works quite well. (The <>5 keys on the right are for volume up/down and mute, the underscore keys
to the right of the shift are apple/cmd keys). The F10 key on the right adds 10 to the Function keys, so F1 becomes F11, F2 F12, and so on,
except that F9 becomes F10.
Here is the layout.

I have one question: The two PrtSc* keys on the right are supposed to be "mission control" and "launchpad", those that on the
macbook air are on the F3 and F4 keys. But I haven't managed to reproduce these keys using soarer...
Does anyone know soarer bindings to get "mission control" and "launchpad" in OSX?
Thanks!