Haven't done one yet, have been asked but always say no. I probably am going to build one at my bros house to time myself, and get a handle on materials. As far as building one with straight block and veneering it with cultured stone, or out of regular wall block I don't think its a problem either way. but I do have some questions. 1)Do you need to fill in the centers of the wall or can I leave them hollow? How much does a gas line cost to run?(obviously I understand the longer the more expensive, but ballpark) I am going to build an "L" type, i'd love some pics of ones you guys have done. are there certain types of granite counter tops that can be used outside, or are they all ok? Are the granite countertops just adhered to the block? Thanks a bunch for any info!