hehe dig a hole in the floor has been suggested before.

And cut a hole in the ceiling.

Nah it will stroke upwards, i have 1.80cm ceiling height, solid concrete floor and concrete roof in my workshop (its a basement) I need to get about 500-600mm stroke.. So i think i just shortened it as much as needed still getting the articulation i want to.
Been trying to scavenge some HEP or HEB steel profiles from a local industry i have access to, but seems to be hard atm. I have also consiered large square tubing like 120-140mm in square for the frame. Cause those i can butt weld a plate onto drill and thread for large bolts and i would have a frame i could take apart easily for moving.
For tables and "roof" of the press im thinking 20mm steel plate of some mildsteel that easily welded, machined and can be swapped out when banged up for not that much money.. Make note the press will be used for different things, but draw die, punch die and shaping metals will be the first order of buisness.. seems it could be used as a forge press as well if proper tooling is made.