Martin, I may have found one. I would be wary of sand cast aluminum made with a part as the pattern. Shrinkage would result in an undersize part.
I am hoping to raise Moby Brick from the figurative "ashes". Right now I have to contend with a whack rear loop which needs straightening. I have set a budget of $1500 to restore it, and so far, between my spares pile and some unbelievably lucky finds on the internet, it looks like I will be able stay under. Once I am feeling a little less sore I may be starting a thread to document the resurrection, although I am terrible at stopping to take photos.