@MartinBergwerf Yikes sry! somehow i didnt get any notification of this reply.
What do you mean by concave quad? It looks like a trapezoid.
And i dont see it in your model but how would you recommend one learn all these fancy techniques with poles and when to use a shape over some other shape?
Feels like a lot of Ai and new tools have been pushing away this stuff but i rather still learn than let a tool do it 100% you know?