How large a surface do you think could be surfaced and handled with the MFS?
The length of the slide limits one direction to about 590mm (~23"). You might be able to get a bit more with a wide planer bit.
The slide in the pic is mounted on an MFS 700 kit at max size, so you see that 700's are the longest rails you need parallel to the router's movement. The other rails could be of any length-- 1m, 2m, 2m joined, doesn't matter.
With scaffolding underneath to support the MFS, the setup could handle oddly shaped things like tree stumps.
Using the idea of the router slide, but not the part itself, you could set up a rectangle as if you were using it to cut a circle, and then use
it as a router slide traveling on two flat surfaces on either side of the work. I don't know how big this would have to be before the extrusions sagged too much. I'm guessing 1m would be fine, but 2? Stiffening might be added.
While the 1010 would work for this, the 1400 with a 1/2"-shank planer bit would be a better choice.
For the really big stuff, the 2000/2200 would be the ticket. I don't think the 2000 or 2200 will fit in the router slide. Anyone know?
Ned