make your own rock?

[StirCrazy]

I have done a lot of reading on this and I mean alot but, I was wondering if anyone has done it? or even thought about it and decided not to do it? (if the later why did you decide against it)

I am not talking about doing all my rock but maby the base rock as I would be able to mold a flat table type of rock with legs that would sit on the bottom of the tank nice.

my line of thinking is I could make the large foundation chunks then buy a nice grade of "real" live rock to sead everything. the effect is two fold 1, reducing the cost to me and 2, less rock removed from nature due to my needs. also it would give me something else to play with :D

Steve