Those are some good ideas, i guess i got some experimenting to do.
The idea you had of making the mortar shell and then filling that in with the epoxy, you dont think the mortar would crack?
I am interested in a way to use concrete to make small picture frames, maybe a 1/4 of an inch thick.
My background is mechanical engineering so i understand a little about the strength of concrete and its limitations. I know that it is not useful in tension and just picking up a concrete frame...