I find the driving position in the Mk3 to be fine, except that, for me at 5ft 10in, the position is too low, even with the seat jacked up to maximum. I have to say that i came to Jazz cars from numerous Landrovers over the years and as a result i like to sit high and see where i'm going!
I have made up a set seat spacers, 20mm for the rear mountings of the drivers seat and 12mm at the front and now the position is, for me, nigh on perfect.