chicago screws
as for a sheath.... i cant see this going into normal production... custom ordered sheath would be the way to go..
but all i see with the falk sheaths is they are injection molded with nylon.... the material works differntly. and im not 100% sure what your trying to express and desire. see i work in a shop so if something needs to be done to make it more to my needs. i just do it. you dont have to be an engineer (god i hope not) to make changes or to get things done for yourself. what you do have to do is be able to communicate your desires in a way some one can make it happen. or for you to draw out and make it happen.
engineers unfortunatly make lots of mistakes sence a lot never work the material they plan to use. i have used blue prints that are impossible my modern tooling. and made changes as needed.
you would make a fortune if you could figure out how to drill a square hole.