Just from a “cowboy’s” point of view, the bridgeworks model is not accurate. You could never get cattle up those ramps. First they hate going up them, so you have to put them in a lane to get them pointed in the right direction and then “run” them up the ramp. You would need to build a small lane in the Bridgeworks pens to get them to be accurate.
Richards is very prototypical and accurate for what they are. His description of the double boards is right on. You put the fencing on the inside so when the cow leans against it, it doesnt pop off the nails and thus the cow can get out. Cattle are very hard on ramps because, like I said before, they hate going up ramps.
I was born and raised on a cattle ranch and still help out when needed. I see Richards and think, “yep thats a great setup.” I look at the Bridgeworks one and think, “oh boy, we are gonna have some fun today.” Not to be too critical of the Bridgeworks model, but just to say you need to modify it to be more believable.