All these jigs are clever and simple, but all have their flaws.

The Hero bike jig is solid, but only allows for the one width of dropout (i.e. if you have a thicker one it throws out your alignment) and one head tube diameter. These are things you can work around with a bag of assorted washers.

There are improvements that can be made to some smaller parts. I'm going to make some parts to improve somethings like nicer cones/plugs for the head tube when doing the layup and a part to go over the seat post insert for the same reason. When you do your layup you can wrap against something sturdy and with a neat edge, so later when you pop everything off you have a nice flat and crisp edge.