Sheldon all of your pics have disappeared or expired... : ( You need to get that fixed as it's definitely a nice example to look at. Don't worry about all of the mechanicals, they can be repaired or replaced, but body work is never something I can personally deal with. Regarding the diff, I have one that I extracted out of a 318iS that I was going to redo, but the shell had way too much rust... so, I ripped out everything. The only thing that the diff is missing is the rear bushing, but another one can always be pressed in. To be honest, I'm not sure if this one made noise or not. Something to think about if you'd like to replace the one you've got now.
Now that you've seen how much it is to get to Switzerland, you should definitely plan a trip. If you time it right, I'm sure you'd be able to find some deals, especially during the slower seasons.
And, Alex is down in Australia with his GF... Sounds nice to me. Beats the heat and humidity here in Maryland! I've finished all of the work on my 318iC and now it's time to start on the 318iS! I can't wait to get this car on the road!! But, it's going to take some time.
Cheers!
bimmerfahrer