While I wait for the second foot to be ready, I tried wearing both legs and trying to take some steps in order to check if there is any weird clash or issue.

So far walking seems ok and also side abduction movements are quire smooth. Of course feel while make the overall structure stiffer since ankle has no degree of freedom about z for the moment.

Here is a short preview of both legs connected to the waist (I had to hold it since there is not yet attachment to the body).