At this very moment, a member of my troupe is finishing his aluminum stilts with our metal-working friend.
The stilt legs are changeable via screw threads, so he can make his stilts taller or shorter as needed. At current, the pegs are 4' (48") tall.
The footplate is welded onto the peg... and the leg support is based on a walking-cast design with velcro threading through the metal form. The footplate is custom cut and measured to his foot.
They weigh about the same as our wood stilts, maybe a tiny bit more. But they're more durable... this fellow does running jumps and kicks on his stilts, and managed to break a pair of wood ones last year.
He designed them himself, though, with a very experienced metal worker. No online or other written plans out there, unfortunately. Perhaps we'll post some technical pics of them on our webpage when they're all done. They still have to be heat-treated, which apparently takes a few days...
Good luck!
Charly
www.cabiri.org