go ahead and run with it, I don't mind people using the design so long as you do not sell it. (as if anyone would buy it!)
FYI, just so you know, there's nothing legally prohibiting anyone else from selling copies of this, should they choose to do so (unless you happen to have a patent on it).
Also, about that CPVC valve:
It appears you used regular Schedule 40 (white) PVC pipe with the (beige) CPVC fittings. This is not a good idea. PVC and CPVC are two different systems with slightly different sizes. Schedule 40 PVC is sized based on the IPS (Iron Pipe Size) system. Its inner diameter is sized the same as iron pipe of the same trade size; i.e., a 1/2" piece of Schedule 40 has an I.D. of close to 1/2". PVC cannot tolerate hot water and thus is not used for indoor plumbing.
CPVC is acceptable for use with hot water. It is sized according to the CTS (Copper Tube Size) system The relevant dimension is the outer
diameter, which is the same as that as copper tubing. PEX tubing, now used for most new residential plumbing, is also sized this way.
So in the case of 1/2" CPVC tubing, the the O.D. is .625" (5/8). Constrast that with the O.D. of Scedule 40 PVC pipe, which is .840". In other words, 1/2" PVC won't fit into 1/2" CPVC fittings. It's tempting to try to use 1/2" PVC pipe with 3/4" CPVC fittings, since the fittings are designed to work with tubing with an OD of 7/8" (.875"). It'll fit, but it'll be loose. If this was a full-pressure system, it would probably leak.