Thank you very much for your comment @acguitar1
Yes, the two guitars are telescope a little I concede! ^^
But initially, it was a desire to do this way ... as in a discussion where people do not understand each other (misunderstanding = "quiproquo" in french) and speak, answer each other, without listening to the other interlocutor. .
But I think it could be better assembled... you're right
I am working on it !!

Thanks again for your message! :)