Apologies - - - - when I saw panel cutter I think I understood panel saw.
I'm looking for something that makes an easy time of handling full size sheet goods (you know 4' x 8').
Useful info anyway - - - thanks!
Ah, makes sense. I would love to have a 52" fence just for that reason - I have the parts to set that up but currently do not have the room. With my 26" fence, I can cut a full sheet of plywood in half lengthwise (or other dimensions less than half), but it takes careful planning, strategic placement of support rollers, and full concentration! Whenever possible, I will cut it across the width first; in the absence of a panel cutter, here is what I find invaluable for that operation:
https://www.amazon.com/ProGrip-Straight-Cutting-Sheets-Plywood/dp/B07ZKS7Y3W. (Disclaimer: I do not have this particular model, and have no affiliation nor any knowledge of how well is does or does not work; this was simply the first one that came up in my Google search.)
Joe or others, you may already be aware of this type of guide clamp, so apologies if I am preaching to the choir. This type of guide is easily adjustable and can clamp securely, with a single lever, across the width of a full sheet of plywood. It provides a smooth and straight guide for a circular saw or router; with care, the results can be very good. (Of course, one needs to account for the offset to the cutting blade or bit!) Certainly a straight board can be used instead, but it is a lot harder to get a board clamped securely on both ends while positioning it on the mark. This type of guide makes it so, so much easier.
For less wide panels, I also have a shop-made jig that consists of some 1/4" plywood glued and nailed to a straight piece of 1x stock. The plywood should be wide enough that the saw can rest on it, guided by the 1x "fence," and cut off any excess plywood. Then the plywood edge shows the exact location of the cut, and can be placed right on the line. Very useful, but - at least in my shop - not practical to make it too long. (The problem for me is storage!) I think the one I made & use is around 20" long.