Watch, safe, phone, activity wrist band thingy, jumper.. various things I've forgotten about.. no socks which sucks! I love socks.
On a different note; i made my son a car gaming chair that is total awesomeness.
There were two more pics here that seem to have gone. Still one pic left to look at. http://www.trials-forum.co.uk/topic/184621-please-close-me-like-a-closed-thing/
One of the pics was on a limey frame.. sure it was from a tf member
Thrres a pic of my zhi sl's here
http://www.trials-forum.co.uk/topic/187005-zhi-team-my-rather-beautiful-build/#entry2579853
Can't remember the weight but they're fairly light.
Tension/torsion. ultimately the more planes that are under or able to take load the stronger said structure will be. I'd assume there to be significant forces at play in that area so I'd go with using one