Plans for the original Klipschorn are on the same site- and I'm not ready for a project that massive. I can't say for sure, but the image you attached looks like the folded horn of the original K. Yeah, it would be a good one- a GREAT one even, but I'm a bit on the OCD side, so the thought of something this complicated would bring me to the point of self-defeat. The LaScala, especially for my first attempt at DIY speaker systems, is the best entry point for me.
ALSO, The original K required (or at the very least, strongly suggests) that you put them in a corner for bass reinforcement, so the room they're placed in have to be taken into consideration. I want/need something a little more flexible. Furthermore, this is a home- not a disco! I'm sure the LaScala would crack the windows sufficiently!