Well, Basher Boshly,
I am 6ft 3in tall or thereabouts and I fit into my 3 Wheeler reasonably well, especially now that I have installed a 50mm steering wheel spacer from Krazy Horse. If you are not much taller than that, you should fit in too (as there is no roof, your big head will not pose any problems).
I have also driven a Brabus Smart Roadster, which I liked very much apart from the crap transmission. I was quite comfortable in it, though getting in and out was almost as difficult as is the case with the 3 Wheeler. I do not recall a bump steer problem with it, but I drove it on smooth roads in the South of France.
So you should stop moaning about not fitting into these things.
