I was recently given a box of the new(ish) plastic Killa Kans by Simon.
In the box you get three plastic sprues, which allow you to make three plastic Killa Kans.
The parts are interchangeable, so if you get more than one box, all your Kans can be different. It would have been nice if you could with a single box make all three carry the same ballistic weapon, but as it happens you can’t. So when I build them I will do one with a Rokkit Launcha, one with a Skorcha and one with the new Grotzooka!
Building instructions are available on the main GW website.