I hope it's the right section to ask this.
I've been looking for the second stage in this video - http://www.youtube.com/watch?v=VNJU96ul3jg - for a long time. It's the second one (Bowser's castle from Mario Kart).
It's not in the Vault (well, I couldn't find it, at least), and I couldn't find it on the forum, Smashboards or by googling it or its author's name.
Do you know where I can find it?
That's really cool. Never seen it though. You could ask Oizenx, I think he also made rainbow road.
We really need more mkw stages
No, Oizen did NOT make any MKW stages.
Here's Coconut Mall: http://www.smashboards.com/showpost.php?p=9805096&postcount=979
I believe Bowser's Castle was never released.