hi vinnie,
thanks to the help of bmarkus, we can solve this problem.
you just have to rename the directory unison-gui to unison and then all works fine.
in the moment you find under /tmp/tcloop/unison-gui the binaries,
but they should be under /tmp/tcloop/unison to work fine.
i'm no expert in packaging, but i would call it "the main directory of your package".
make it easy and forget that stuff with unison-gui...
perhaps everything is solved, if you change all directories
that are called >unison-gui< just to >unison<.
i think you will not expect more other problems and you need no symlinks.
I already tried to reduce the size of the icon, but this did not work for me: I tried to use seamonkey icon (which could be seen on fluxbox), but nothing.
However I will reduce the icon.
just open the icon-file unison.png with gimp and use the scale option to reduce it
to a smaller %-value and save it under the old filename "unison.png".
just try it, you will succeed.