What is the sequence of assembly and useful ideas for the 'radial coupler'? I didn\'t see the radial coupler at first and could never get the thing to hook to other stages without blowing up or breaking itself. Once I found that piece I was left questioning why it would hang out of the bottom of the lander in thin air, etc. I must be doing something wrong. Is there a simple lander with a rocket stage attached to download? Or maybe just a simple assembly diagram or instructions?