Since the Kettlestack adjustable kettlebell design uses standard weight plates the final shape is up to you.
If you care about the shape of your kettlebell, slow down and go through the whole page.
Here is a side and oblique view of a setup when the plates are concentric (NO tweaking)
The transition between the 5 & 10 lb plates might be abrupt enough to present an edge.The bottom line is to FILL IN THE GAP so the forearm sees a smooth transition.
The next picture shows the tweaking shifts as yellow and red arrows;
the 5 lb (yellow plate) is moved up and the outermost 10lb (red) plates
are moved down to effect a smoother transition.
These tweaking steps are actually easier to do than to describe; In fact, they're automatic if you use a 6" bowl you can get at the hardware store for $3 .... and follow the steps in this video http:/www.kettlestack.com/assembly/easy_assembly_video