Shaef, I wouldn't stress at all over making areas for the BG to spawn. They will find areas that suit them, they're sorta like rabbits. I made 2 different spawning areas for BG and they ignored both of them.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).