Mark,

target crew weight is still 45-50kg (I've left some extra freeboard in to cater for heavier crews or two people).

The concern with trapping is the extra compression load applied to the rig. The rig I'm looking at is designed for a two person, one on trap dinghy (MG14). With a 60kg person hiking on the cat the mast will experiance similar loads to what it would see with one person trapping on the less stable mono. I've gone with this mast at this stage because its similar in shape to most modern cat wing masts and because fully rigged it will be less than 6kg (a weight that will enable kids to rig their own boats). If you wanted to be able to trapeze its only a matter of talking to whoever you buy the extrusion off and discussing what section they would recommend (you'll propably end up a couple of kgs (4lbs) heavier at the most). The beams and dolphin striker as specified would be fine.