I make mine about 4-inches tall, perfect for use around here ( Arkansas) for the rocky shores Im beaching on.
One caveat though.
the last 2 that I have made out of 2" pvc have eventually broken.
Ill be making them from 3" pvc from now on I guess, that pushes the cost up to about $30 worth of pvc I think.
Im very tempted to simply make a "ladder" frame of PT lumber and bevel the 2 high rails and glue turf on them.