[TEntwistle]

I really think that the holes in the bracket are going to be used to mount the shown piece to a support, making it a field element. The holes are in a similar pattern and size (relative to the bracket device itself) that are seen in brackets used to mount joists in deck and home building. Someone had mentioned a 2x4 earlier in the thread. If this is correct, then the length of this unit would be roughly 6". If soccer balls are to roll on the track, you could have relatively long expanses of track between the supports (if that is indeed what wee have been shown)