Welcome to the forum and the world of the GTD, Jan.
I had exactly the same problem as you when I bought my GTD - I couldn't drive it because my feet were too big for the pedals and my head stuck out above the windscreen.
I wrote an article for the GT40 Enthusiasts Club magazine on how I got round the problems and ended up with a very comfortable motor car. The CD of all back issues, including this one, is available to Club members for £15 and has far more besides. Details on the Club website. Incidentally, we have 6 Club members already in Switzerland.
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Welcome, and enjoy your car.