Unfortunately I overestimated for shrink between the two uprights and they are too loose. Although far from perfect castings they would have worked other than that.
There was some shrinkage on the very center of the parts underside but it would not have effected operation.
I will hang on to these but may make a new pattern and try again.
However I have a built up a version from stainless steel sheet and mild steel bar that I most likely be using in the near term.
The built up version is preferable because the uprights can be formed/bent past 90 degrees which will cause them to grip the crucible yet flex if it expands while heating.