I have the original slide holder, but don't currently have plans to model it... I think that one would be a bit more challenging with the limited tools I have available to me. But, it's something I can consider.
BitbyBit carries 3D scanner carriers. AND, if they don't have what you want they might create one without any additional charge. They made SEVERAL, special-order, submini, negative carriers for me for the Beseler 67 enlarger -- at their REGULAR price!!!