I'm not sure exactly what that describes. I don't know how a thinner skin can be glued onto the very front edge without a visual join line.

There are chinese factories that do list making knotted skin pieces with front 1/8'' as v-looped on 0.08 mm (3 mil) skin throughout.

The only people I have seen listing knotted skin bases are listing it on 0.08 mm bases.

I think 0.03-0.05 mm might be possible theoretically for knotting, but I expect it would be very fragile since the knots could just pull through (unlike v-loops where the whole loop would have to tear to come through).

I never thought about that but you could be right about the base being too thin for knotting. Two steps forward, one step back.

The site from where the pictures origin does not have a 0,03 mm skin front - I know, because I have there thinnest skin piece.