Is my leg formation for this roundhouse kick correct?

[OneKickWonder]

From the screenshots I think you need to rotate your hip over more. Turning the base further would give you that. Your standing leg finishes inbound of your hips, I would suggest giving yourself a bit more distance, rotating the standing foot more and extending your hips.

As for the chamber, watching the video I think it's coming up when it could come round more. A basic test is to try kicking over the back of a chair. You should be able to go over without knocking the chair over.

But if my knee is parallell to the ground when connecting compared to vertical? Which is the proper roundkick configuration?

If your knee is pointing up, it's not a roundhouse kick.

There is a kick that sweeps round that does have the knee pointing up. That's a crescent kick, or in Korean terminology, ahnuso pakaro chaki (don't know if that's spelled even close to right). Crescent kick and roundhouse kick are very, very different kicks.

[bushido_man96]

In the first clip on the other post, I thought your rechamber looked more like that of a side kick than a round kick. In these pics of the already extended kick, all I see is an extended round kick.