Its actually 2.5mm thick, still thin, table itself is rigid enough. Gantry will have 50x5 to joint both legs, so should be no flex. In addition I use 5mm base for mounting all gantry blocks THK15. Will upload some photos after welding. Gantry is complicated as has to be adjusted to match the distance between rails on the bad. I will machine/plane X bases before welding them to top part (X mounting profiles). After all will be final machine to keep straight angle between table and Y plane and between base for blocks and Y plane - will do pictures as is confusing enough:)