I don't have a link or a number for slide out panels, but the design is simple. There are several ways you can do it. One very simple method is hinging the bottom of the panel, and allowing the entire panel to swing out to gain access to instruments and wiring. You can make the panel in sections in order to do this, and have one section at a time swing out. Secure the top of the panel with any type of fastener; if you plan on working back there a lot, use camlocs.
Alternately, you can use rails or roller assemblies and tracks to slide the panel straight out. It's easiest if this is done in sections. You can make tracks using aluminum angle, and support each panel section on roller bearing tracks straight off the shelf at a cabinetry shop.
I'm still in the empenage state of my RV-6, which unfortunately is stuck in a storage locker far from me for the time being...but I'll probably sectionalize the panel and make it a slideout. In either case, tip-out or slide-out, allow enough hose and wiring to make it work. Too many panel installations use the bare minimum amount of wiring and then tie off the slack. When I do panel work or change an instrument, I always carry medical forceps to capture the wiring when I take off a cannon plug or lead, so it doesn't disappear back into the panel and get lost forever. This shouldn't be necessary; I should be able to withdraw the radio or instrument or gauge or switch, and have enough wiring to bring it out and clear of the panel.
Too often folks installing the equipment don't give much thought to those who will eventually need to work on it.