Yes, there are some photos of our setup
on this thread. It wasn't cheap, but it wasn't £3K either!
My only regret was that we used large stones for the base, which are hard on hooves and tipped up sheep, so I wish we'd used something smaller and rounder. Apart from that, it works really well, and it's nice that once the sheep are in there, I know they're absolutely secure (ours will jump out of hurdle pens if they feel like it).
We use it by catching them in the biggest square, then using the 10' internal gate to herd them into the top rectangle, then shoo them into the square at the top-right for dosing etc. Although it's not a race as such, it's easy enough to dose or inject and then use a sheep crayon to mark the heads of the animals that have been done.
The sheep can then be 'shed' by opening the gates out into different fields, or into the trailer.
I hope that's helpful