That looks like an slick tripod. The rectangular mounting plate with the 1/4" screw looks a little big and may appear in the pictures. Is the extender (the description refers to it as column) in the picture for the the rectangular bottom plate, the space between the camera and the mounting plate?
That actually looks like some pretty nice kit for cheaper than the Manfrotto base and extension setup.
Comparison
I’m curious as to whether or not you’re mounting the camera directly on the rectangular base or using an extension. I was actually looking at this same problem myself, but haven’t found anything. If the ball joint was removable and you could put an extension on it, looks awesome.