http://www.beechcraft.com/customer_s...1_Section1.pdf
That's the POH, Section 1 directly from Beechcraft and has all the aircraft dimensions starting on Page 1-8. It'll give you something to work with. You won't get much more accurate than these numbers without a tape measure.
As far as "Distance to Pavement," have you considered this will vary with the height of the pilot?
The King Air 300s a previous company of mine operated did not have a Design Eye Reference Point and, thus, the viewing range would be dependant upon pilot height and seat position. I don't remember the King Air 100 or Beech 1900D aircraft having a described Eye-to-Wheel height either and all the ones I ever heard of were apocryphal.