Hi Creative - Dave here, I started life in the industry as a modder and PC builder sponsored by many companies (including Alphacool!)
Distro plates are a great idea for reducing the need for complicated tube runs and/or to get that visual look you want to create. Your idea will work as long as you're using a pump that can handle it, it will increase restriction though (as with every component) but how much will only be seen when you try it.
It should look interesting for sure!
Also, if you add a fill port to it, you could use it as a reservoir at a 120mm size (even an 80mm!) however, you would have to add a separate reservoir to feed the distro plate whilst you filled the loop, then remove it once there was enough fluid to fill the loop again. This is how I have done it a couple of times (and also done reservoir free loops!) they work well, but are a lot trickier to fill and empty