I have made a few because there are no slim front-pocket wallets built for UK-sized money that aren't useless trendy kickstarter crap that have no place for notes. It has exactly as many card pockets as I need and nothing superfluous at all. This porter one I found is not only non-leather, it seems to be fairly slim too which is great. It's also made of the same material as an MA1 bomber jacket.you make your own wallets ?
Mine's made of 1.3mm vegtan leather hand oiled and tanned out in the sun, heavily stitched and denim on the inside. over a year and it's as good as new!