There seem to be a few reports of 6-7" depth, but I would think it depends on your actual build, if there is physically room for it.
I do not know if I would be able to get GRS, either financially, or just physically.. emotionally, I probably could, as it would signal the end of the journey. but the After-Care (not just recovery), would be something I am just not able to do, the way that my work is. Leaves of absence are one thing, but the daily required after care isn't not something I can do. just not possible. =(