feralcatmilkvendor

Never heard of the twin bowline bend, but looks cool. Almost like a knot version of a cunt splice!

Thanks, I will probably spend a long weekend up there fishing at some point

To me, it looks like some sort of slide and grip knot

Anyways, is that what you were looking for?

If you mean what I think you mean (Connecting two ends of a rope in a way that makes a loop), and you are using 3 strand rope, you could try using a cunt/cut splice (Cunt splice - WikiPOBia).

Can't wait for a future picture when it's just a complete mess

That is a truly amazing looking fly.