So this amount of warp is not that bad, great. I recon from what I can see in the plans, that it might actually not be bad at all since it lines up with the main fuse sides perpendicularly so it will be forced to sit straight.

For the table I have a hollow door as a base. Then, I have a sheet of ply over the whole door surface and then I have a ply backed cork. The table I built myself and its practically flat. Its off about 1 degree in one axis and perfectly flat on the other axis.