Other Half housing contactless NFC credit card

I wished the TOH would be 1 mm higher so I could put in my contactless credit card. The credit card fits in well concerning lenght/width but in height there's a tiny little bit missing :) Having a TOH giving 1 mm more in height I would have a perfect "pocket" for the credit card so I could pay an McDonald's etc. by just putting my Jolla on the contactless creditcard reader ... EDIT: anybody having experience in warmforming polycarbonate backcovers ? suitable temperature range ? EDIT: newest version of flypig's design (see comment below) - please contact him if you're interested to test one: http://www.flypig.co.uk/toh/images/contactless.jpg EDIT: Similar approach for storing spare SIM cards: https://together.jolla.com/question/53724/idea-the-other-half-storing-spare-sim-cards/