I have admired the Tilley AL8 and AL9 trackwork lamps and to date no success, but I will keep trying. In the meantime I ran up my prototype of the 'robust frame' that they stand upon. I fabricated the rivets and snuck a small amount of weld in a few places but mainly it is rivets holding it together. I got a couple of minor things wrong in copying from pictures but reckon my next one may well be harder to pick from an original. Iain The rivets were made from small bolts. The screw that holds the lantern on. I shortcutted the narrower cross member which usually goes under the main central bar because it's usually out-of-sight. I learnt from this and the next will go under as per original.