Given Nitro-Genes box-wedge shape with a 42* hindged front wedge, I didnt see the need to place a speed bump on the top as:

1) It may have interfered with self-rightinig
2) It would look odd.

Talking of Nitro-Gene, hows my picture coming along?

This is a message to Matty Folwer - will you please send in your stats to the MN2 series so Martijn can continue writing.