For the T I M E and money spent on making homemade live rock, see if you can locate some old cheap (once) oramental coral, or dead live rock..... Run an ad on Craigslist for it in the WANTED section......
I bought a mixed lot of fish crap off craigslist, skimmer, pump, heaters,etc.... part of the deal was that I had to take it all...... about 50 pounds of Dead live rock sat at my back door for two months before Tony gave me the idea to cycle it and use it.
I have a friend in Kennesaw that has dead live rock sitting under her porch
from a tank die off 10 years ago....... Its probably more common than you'd think as sooner or later much of the live rock people buy will end up as dead........ eventually (kinda depressing, huh?). And like most communitys, trash pick up regards dead live rock the same as concrete, and wont pick it up. That avenue would be worth looking into rather than waiting 6 months to use completely homemade live rock.........
Just a thought