Already having a Festool MFT-3 table I decided to build a milling table extension from aluminium profiles. For the top board I made use of a CNC mill to make an accurate cutout for the Sauter Milling Table insert plate.
I'm still missing a proper fence with dust collection. But so far the table is doing a pretty good job being very rigid and stable.
I can easily unmount it from the MFT-3 table and store it aside if I need the space.