It's been so long since that press, I don't remember what he had for the die holders.....can you post a pic?
On the one I had, the biggest mods I made were replacing the bottom die holder with a 1/2" wall square tube that went to/was welded to the base. The die holders were 3/4" thick plate, with a "riser" that was 2" narrower, under them that allowed for using 1/4x1" angle welded to slide the dies on/off the holders. I always made sure that I left extra "slop" in the fit, because otherwise they'd get stuck when hot and I couldn't get them off until everything cooled down. I had to think hard to remember what I'd done to that press..... since getting my hands on orange crush, I've not though out anything else in a LONG time.