Yes, its longer than the opening (because the post was not in line with the opening and I didn’t want it to swing through the other way), yes, the post is not level, yes, I should probably not have used an existing fence post, no, I will not be fixing it. But look at the fit on the diagonal. MINT
Your diagonal is correct. I can’t even count the times I’ve seen a diagonal the wrong way round. (Upperleft to lower right). It’s remarkable if you pay attention. And than they wonder why their door starts hanging after a few weeks.
Yeah, wood doesn’t really work in in tension I never got why people do it the other way. It works for cables when you want to pull it back the other way but not woth nails or screws that pull out.