this is a good point with the scars from bottom bouncing...I had the same idea like you with making a cup from aluminium or something else, but I never did it...
Casting abilities of this one are not very good due to the shape...it is almost like a boomerang :-) and the action is very agressive because it is almost half a circle.
I didn't fish this lure very often...thus I can't say too much about catching fish with it...maybe I should try it again...but there are so many other nice lures I prefere at the moment...especially my swimbaits...they are real weapons. Then it's always difficult to try other things :-)
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