From my own experience refinishing a 108 Dash. The strip at the base of the windshield can be removed after you remove the plastic padding on the inside of the A-pillars. Assuming your car has these instead of the wooden strips of the earlier 108's. You simply pull these strongly straight back from the a pillar till they pop off. Then remove the wood strip carefully. Investigate this thoroughly beforehand as it's been a long time since I've done that and I cant remember the details exactly.

One thing I do rememeber vividly is the way I destroyed the veneer by thinking the smart thing to do was to sand off the bubbling/lifting varnish with an orbital sander. Not smart. You need to find some good quality varnish remover and test it on other wood first. I suggest you look at JamieKopp.com's website. He's has several 108's that he's done a lot of work on and has accounts of re-finishing the wood on his 250's. Some good pictures too.

Good luck. Wish I could have found the 4.5 before you...

- Peter.