I remixed Frank van der Hulst's great idea.
The tray holder was not stable, it was easily turned. Because of the one-piece design, two screws are enough, no twisting or wobbling.
The holes were tapered and my allen screws came loose, pushed into the FEP film. Now the screws could be the internal slotted hex head screws that are commonly used on printers. They don't stick out.
I modified this bracket: https://www.thingiverse.com/thing:4930399 to fit the original piece that fits on the Halot One frame. thanks to Min's Craft
I placed the holes slightly lower on the VAT holder so the funnel fits better underneath
The author remixed this model.