Does the wax foundation for brood that you can buy with the 5 or 6 vertical wires already embedded still need to be cross wired? Or is that sufficient support by itself?
If you're using it for just brood you don't need much support. Just a little to keep it from sagging. It gets much tougher after it has cocoons in it. If you are gentle you could even extract it (even without any cocoons) once or twice.
Of course wired or not, I wouldn't install too much too soon because it all warps eventually if it doesn't get drawn out right away.