Whoa! I have to admit my first reaction to that kit was "wow, a high-priced solution looking for a problem." But then again, it's the OP's money, and the beauty of hobbies is they don't have to be economically justified. You could mount a step-up ring of suitable size and use a second ring (or work with the old series adapters and retainers) to allow clamping in a pinhole plate and achieve relatively quick interchange for way less money. But, if the OP indeed has (or has ambitions toward) LF cameras, mayhaps it all makes sense.
To me the biggest problem is that the camera box to mount that turret thingy on should be mahogany or cherry with polished brass fittings, and maybe some decorative inlays, to be consistently fashionable.