Just a quick hidden shelf designed in tinkercad. So far people have either wanted money for theirs or were missing the actual hidden portion to attach to the wall. The shelf is 225x100mm and the bracket is 210x90mm so plenty of wiggle room on either side for ease of install. The screw holes are designed for a 10mm head with a 6mm thread. Screw holes are 19mm thick. I'll upload photos tomorrow once the print is done.