Our Fletcher has unlimited length, left to right to hold anything cut-able, but has a 65" up and down cutting range for the various substrates. So, we can put a 5' x 12' panel in there. Once you get something under 65", you can turn it 90º and cut it the other direction.
Other than a panel saw, I don't think you can do what you want, with a Fletcher. We have the big Fletcher, a large Keen, a panel saw and also a table saw and some chop saws, so we use the appropriate cutting device to meet the needs.