Still aiming at interchangeable outer soles for my final build of Relic's foot-paws. If for any reason it becomes evident that it will not work as I intend, the construction is still such that I can simply attach a regular sole and move on.
I finally have the straps affixed to the inner shoes that will carry the weight of the sole instead of having it fastened directly to the foam alone. I used some heavy duty snaps and 1-inch elastic to connect the inner sole to the inner shoes... I had to use small machine screws and lock nuts to fasten the snaps to the shoes as they were too thick for the post on the snap itself. just have to trim off the excess screw length inside the shoe before wearing them, no big deal. I have been able to keep the construction together in a way that most everything is removable / replacable. The inner shoe can be removed easily, even the inner sole will be removable with minor glue cutting around the bottom edge of the fur once it is on, and of course with a small fortune of Neodymium magnets embedded in the two parts of the soles the outer soles will also be removable / interchangeable.
So at this point they are structurally complete and ready for patterning for the fur. I have to find a proper mid-sole material to attach to the bottom of the inner sole then I can fur them and work on creating the outer soles which one set will have fur and pads strictly for indoor use and the other set will be a flat nonslip sole for use indoor or outdoor.