Need to make a 9x12cm film holder myself as my new Epson 4870 scanner comes only with a 4x5inch holder.

This should be an easy task if such a holder just needs to hold the film flat and ensure that glass and slide don't touch each other.

On the other hand things would get a little more complicated if the distance between glass and slide needs to be exactly identical with the 4x5 holder .

Any advice is very welcome.