Making HP Calculator Battery Packs

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My love of Hewlett Packard RPN calculator is well know, at least among people who put up with me.  My favorite is of course the HP41C and it;s variants.  Next on the list is the 20 series, especially the 29C.  The holy grail for me is the HP67, the handheld version of the HP97 desktop machine that I use daily at work.  Digging through stuff I found a battery case for the HP29C that I had cracked open in preparation to replacing the batteries.  I decided that this would be a good project upon which to hone my mold making and plastic casting skills.