Before you start connecting you need holes. Therfore use a puncher or a special bin rail. The hole-diameter has to be larger (1mm) than the grommet-diameter (5mm). This is necessary because the grommets fit better and the pieces stay flexible towards each other. The connection of the pieces works well with grommets (do you call them grommets?). For more solid connections, especially between the can pieces and the steel band, use blind rivets. The steel band helps you to strut some parts like the helmet or the shoulder components.