However now that you are in the test bend phase I think I can see where you are not planning on adding in the strengthening members I feel would be prudent for a press break of this width. Many much smaller breaks than yours have much heavier built tables and traveling beams
The relatively thin webs of your beams may become problematic over time. especially the table beam if you are applying 30 tons of force in the center,
to me it looks like it should be boxed in to add rigidity and an adjustable truss brace underneath it with a series of jack screws forcing up to the bottom of the beam over time these may have to be adjusted to maintain flatness through the 6 ft length. Not saying it will need this but not a bad practice to have them and never need them than not to have them and have a 6 ft bend go rainbow on you.
I would box the traveling beam as well for much the came reasons the web offers very little resistance to twisting.
you may find that someday you have a sheet of metal that turns out to be thicker or harder than you and anticipated then you might be tempted to add another jack or a pair of them or have multiple hydraulic cylinders to to the pressing By stiffening both the table and the traveling beam prior to this you are or can be in a more comfortable position not to destroy such a fine machine.
Also by adding another feature called cross equalization stabilizers to the ends of the traveling beam will prevent the beam from ever becoming canted to one side or the other.
These are simple devices to install usually either roller-less roller chain or leaf chain or can be wire ropes 1 would be mounted to the top of one of the support frame members then pass under a roller mounted on the traveling beam then over a roller on the opposite side then down to the bottom of the frame on that side then the same thing is done in reverse starting at the top of the structure of the opposite side then bringing the chain / cable across and ending up at the bottom
this way if one end of the beam tries to go up the other end must go up at the same amount. Your guides then only have to keep the beam vertical and receive no stresses from any other plane of movement. .
Just a suggestion not a criticism.