I just completed these two items after a few months of fooling around with magnets on the weapons.  I had done the regular walkers previously, and thought that my magnet system would work on these as well.  Boy was I wrong!
Everything had to be scrapped and a new way developed.  This time, I even cut up tiny pieces of metal sheeting so that I would not have to worry about polarity.  Given that there are 20 weapons, that could be an issue!
Anyway, these are some quick shots off the production line.