The legs are available as an optional extra. They are worth while as they lift the hot part of the stove above where it can do much damage to the ground. The stoves already have holes to take the legs.
Fred - are you sure about this? I've just had a thorough look at the site, and it does read as though they come with the firebox.. (i.e. the main description mentions them, and no reference to accessories). I'd be very concerned if I ordered one, as per what they state on the site, and it came without the legs (every photo also includes the legs).
I think it's more likely that anyone who doesn't have the legs has an older model?
And does the design warp badly? its justy that I have a firebox based on the original design and over time it warps so badly that I find it quite difficult to get the thing aligned so it slots together easily.....
Graham S is the man to ask - though it's fairly heavy guage steel - how thick was yours?
http://www.canoepaddler.me.uk/yukon.htm
1.6mm steel.
The smaller version is of titanium which does not warp. But...at a cost.