Hey Mark.

I won't be doing this alone (thankfully), while I'm good with electrics and stuff, I'll have a more mechanically-minded person helping me with this also. I don't know if its too clear in my avatar but I've already thought about weapon locking bars as I've designed in some holes in the top/bottom panels to hold the bar while arming up.

Little Spinner is just a working name, if/when it gets brought to competitions it will be named something more imaginative (Someone at work suggested BANG! but I haven't done too much checking to see if anyone is using that one yet).

I'm probably going to spend some time today actually working out what parts I need and maybe getting sizes and physically laying out bits of cardboard on the floor to get a sense of size/area needed.