Just a suggestion, but you could buy base rock here: http://www.whiz-q.com/ and put live rock on top of it. The base rock will become "live" over time, holey rock is 15 cents a pound, lace rock is 75 cents a pound.
Of course you may wish to go with all live rock since it's already got pretty corralline on it, pods, worms, etc. But filling in the unseen areas with base rock is a great way to conserve money.
Layla started out with only a chunk of base rock, about a 25 pound piece, just added corals that were attached to little pieces of live rock, and now the base rock is covered in purple, pink, blue, and green, and has tons of critters growing in it.