Hello dvdl

( I just remember my first beginnings

)

) )

first get real/estimated data for "base building/structure":

bottom surface 55x55m

top surface 20x20m estimated

height 30m

consisting of 9 boxes/cuboids

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**to get a** (not mathematical exact, if you want, do your own thoughts about

height and 9 steps, but you wrote "approximately" :-))

**shape** for the "bevel values/estimate":

first draw a box/cuboid

size to 55,30,55

move to 0,15,0

select the top surface

size to 20,0,20

then draw a second box/cuboid

size to 55,30/9,55

move to 0,30/9/2,0

select the

**top surface**
scale to 97,100,97 (try, estimate)

then duplicate box/cuboid/object to get the third

move to 0,30/9*1.5,0

select the

**whole box/object**
scale to 92.5,100,92.5 (try, estimate until "bottom-vertices" fit to shapeline)

and so on .....

I suppose, you are familiar with using AC3D commands ...