I'm 6'2", and weigh 210, and by adjusting the 8 way seat not only do I have more than adequate headroom, but I have more legroom that I did in any of the Mustang GT's I've owned for the past 15 years. I also don't miss tilt; I find that I can telescope the wheel far enough forward that it's comfortable, and with my hands at 9 and 3 I can see all the instrumentation and still feel solid enough to race around an autocross course.
I'm not too worried about getting into an accident in this car either; the safety features are enough to keep me calm.
As for the cabin-size, everything had to fit on the SLK platform, and that included the bulkhead for stability.
Granted, the Crossfire isn't for everybody; obviously it's not for you. Still, designing a car for "4 foot Asians" or "African pygmies" hardly makes good business sense either, and I doubt that anyone at DCX was considering that segment of the market when the car was designed. Just a guess.