I was actually thinking about doing the same exact thing, but using a piece of plywood with an angle (45ish degrees) so that the BBs felt straight down.
Guess your solution is better!
Thanks for the plans btw.
__________________
 NEW BACON FOR SALE!
"WHEN I DIE
BURY ME
UPSIDE DOWN
SO THE WORLD
CAN KISS MY ASS"
-Platoon
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