Schematics for building a 2x10 monitor?

I've found that my Ampeg 8x10 sounds great, but I have 3 guitar players in my band, and with their stacks and the fact that they go thru the monitors, I sometimes can't hear myself. I'm looking at building a 2x10 bass cabinet to use specifically as a bass monitor, so I'll be able to hear myself much better. Is there a site that has schematics as to how to build something like this? I'm thinking something along the lines of a GK 210RBH, which tilts back. Any help is greatly appreciated!