removable flat panel on rails (not a control panel)

[SavannahLion]

Given a nominal thickness of wood (any thickness, 3/4 is a good start). I fabricate a U channel frame for the panel to slide out on a given side when "released". Any ideas, short of a precise cut within the channel, to prevent the panel from shifting around in the frame?

Note, there is a front and back to it. Like a picture frame but I don't want to remove the panel straight out the back because I might not have full access to the back. Hence the need to pull out the side.

I can pull out through the front, but I can't think of anything there either.

[BadMouth]

You're being pretty vague, but this might be along the lines of what you're looking for.

http://www.ptreeusa.com/ttrack_list.htm

I'm using the miter t-bar with miter track combo for my current project.
(If I ever get back to working on it.    )

[BadMouth]

Oh, and Lowe's sells 3/4" aluminum channel to fit plywood.
http://www.lowes.com/pd_55981-37672-11385_4294934474__?productId=3058185&Ntt=3%2F4%22+aluminum&pl=1&currentURL=%3FNtt%3D3%252F4%2522%2Baluminum&facetInfo=

It might fit a bit tight for your purposes, but it's easy enough to try in the store.

[SavannahLion]

I'm trying not to be, honest. When I'm not err.... busy, i'll do a sketchup.

Those channels seem to perfect. I didn't know they made channels to fit the nominal dimensions.