maybe I'm missing something... but there is different scales of the fence you're using already. About as many different lengths as you could ever use. Why don't you just use those?
It's not the fence I want, it's the barbed wire on top of the fence. The only fence that has it, and it is exactly what I want, is the security fence. It only comes in one size, really freaking tall.
If i put the full length of the fence on top of the wall, which is really tall already, you're never going to even see the barbed wire.
It looks like I just may not get to use it at all.