Quite special geometry, how to approach it?

 From:  Heiner (BILDERMENSCH)
5791.13 In reply to 5791.8 
Hi Mike,

i was working on the model yesterday, trying to apply your workflow.
Basicly it works fin, but i can not figure out, how you get the slope applied
to the top surface?
Can you explain that a bit more in detail?
Thanks
Heiner