how do you get past the unfinished look tho? For me that is a large part of my sand bed (2"-3"). I just cant see me liking the way an acrylic bottom looks. I guess i would have to see a BB up close. 
I am getting ready to move my tank so we need to deside this issue now! 
You have any pics of your BB Jack?
After this thread i did deside to stick with less rock tho.  About 135 lbs in a 140. lots of shelves and caves is the plan with an ass load of water flow.
maybe i will cut it down to 1" sand bed too