treat the stumps as if they are your foundation walls
set a level grid for each level needed and create the views for each level then design you house.
if your stump heights vary then create a level for each stump height
set a grade level then set levels as needed going up.
roof level = 25
2nd floor = 18
1st floor = 10
Stump 4 = 3'-0"
Stump 3 = 2'8"
Stump 2 = 2'-0"
Stump 1 = 1'-10"
Grade = 0
worst case scenario is all your stumps are different heights you would need to block up to the heighest stump then place your structural deck @ that elevation.
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