I am truly impressed with your stanchion build! You obviously care about your Jersey, adding the slip-prevention grid, and mentioning you'll sand the boards that are going to be by her neck. I will be checking out your other videos soon. (Oh, I do think the feed bin is twice as big as it needs to be, but I've been wrong before.)

You will probably need to add some support braces to the feed trough frame. Seems a little bouncy. Overall a great job that you obviously put a lot of though into.

Why put a floor on it?