Latticino,
I appreciate the concern, those welds on those vertical seams are for sure not the greatest... long story short I didnt account for welding those vertical portions prior to welding the frame together and didnt properly clean/prep the metal in those spots. My angle grinder and die grinder were only able to remove so much of the paint/primer that was in those tight spots and my tig welder was having a terrible time with it. Had to resort to stick welding which unfortunately I am still not great at. The tig welds elsewhere are far better than what you can see from this one angle... but regardless i'll be extremely cautious when putting the press under load and overdo it on PPE.
The guide design has 1/2" plate on both sides and almost an 1.5" thick where the cylinder connects. The white pieces are thick plastic meant to be wear plates which I will likely upgrade to something like brass in the future. If you have any suggestions for a better material in those spots I would love to know. There is minimal racking currently when testing the system without load, at worst it's maybe 1/16".