Trays for Permobil F5 Wheelchair

I made these for a buddy's new wheelchair. It stands, which is awesome, but he couldn't work while the chair was in stand mode because his keyboard was on his desk. So, I made these little trays that plug into holes that he doesn't use while standing to set the keyboard on. Turns out, they're pretty useful...especially with a little Velcro and a cup holder. They've held all sorts of things: Remotes, Beer, Nachos etc...yknow, important stuff. They seem to hold 5ish pounds pretty easily, but no gu