That system looks overly expensive. Skidim sells a set of drain valves that mount directly to the block and manifolds for about $80 IIRC. You could probably get brass ball valves at the hardware store for 1/3 that cost to do the same thing, even plub them all into a larger hose that you can drop out your drain plug and not even drain the engine into the bilge.

I considered doing one of these systems myself but worried about valves getting plugged and having to pull them out and use a pick to be sure the drains are clear. Mine is direct drive so it only takes like 10 minutes to pull the plugs. For a vdrive with limited access to the plugs I would consider valves if you pushed into freeze season and needed to drain it a lot.