Hi, did you find an answer for this? If the frame can be shortened to only 1’ from each corner it would let us put off raising our brick shed roof until a later date and crack on with some more fulfilling projects instead.
Jake
There isn’t a hard and fast answer for what will or won’t work. The performance at the edges just goes down a bit. I’d say wait and try it and see if it works for you before modifying the shed 
Bar…I have a question on the image that was sent out for the frame. On the vertical measurement you have 2’ on either side of the cutting surface but only 1’ on either side of the horizontal measurement. Is the the overall 8’x10’ frame a geometry thing or can it be be 6’ x 10’??
the frame can be any size (limited by the length of the belts), but as you get
closer to the edges of the frame, the angles of the belts make it harder to pull
the router towards the edge, so speed/quality will decrease,
If you anchor the belts low to the workpiece (as Bar has shown it done so far)
you also end up with a steeper angle the closer you get to the anchor, which can
also be a limit.
Per Bar’s original statement of wanting 2’ from the workpiece to the edge, a 4x4
frame would have a vanishly small work area. But he’s showing that it’s not that
strict a limit.
David Lang
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Cheers Bar, needs rebuilding anyway but it’ll last until next winter so we’ll see how we get on with the smaller frame 
Looking forward to the delivery coming!
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@dlang is exactly right. 8x10 is really recommended if you want to use the full sheet, but its not necessary. The performance is just better the bigger the frame you have space for.