I agree, you could sell those. I'd buy one.
One idea you could try for a "version 2", make the attachment clip part horizontal so it it could work with Eurobraced tanks.
Nice work on the acrylic, I've never had much luck with bending acrylic. Either I heat it not enough and it snaps, or I heat it too much and it discolours (once I had it even bubble up a bit).