Actually, since you ask, no, it works like a hot damn. Well, perhaps one near trivial thing - the opening in the frame could be a half inch or so wider in case I had to replace the jack and the new one was weird and would not line up properly. I doubt that this would ever be a problem, but if I was starting another from scratch, I would build in a small contingency there. One other thing is that I support mine in a bench vise. If you want it to work free standing, you would need to add some sort of wider base to make it stable while pumping. You sure wouldn't want it to fall on your foot. You could go with an 8 ton jack, I think, but there is little difference in price, so I went for what is likely a bit of overkill. With the 3x5 plates, the press does an easy job of three pucks, I can't remember how many grams in each. I pre-compress the pucks in one of those puck makers.
If you are interested in my design, have a careful look at the photo, and if there is anything about the setup that doesn't make sense, let me know. For now I will point out one thing that isn't that obvious in the photo. The lower mobile plate is secured from rotating out of alignment with the top plate because the plate on top of the jack has ears that slide up and down between the twin side columns. If you look closely at the photo, you will see what I mean. Because of this function, you have to use twin columns on the sides, or use another means of locking the lower plate in alignment.
This little project probably saved me almost as much money as my DIY lights.
If you can weld cast iron, you are a better welder than I am.
View attachment 1419703
Oh, and I forgot,
@Cave Dirt Cody and
@Daledenton84 the springs are from a trampoline, I found a pile of them a the garbage dump. You can buy them online in replacement sets of six. Two of them do a perfect job of opening the plates when the jack valve is opened.
hubby is going to have a rough day tomorrow so we celebrated Valentines Day today. I was planning on pulling out the bong for the first time in a over year but I think this worked just as well 
. i will be putting a post together when i do build it where should i put it?
Me too...
.....
For now, I'm thinking about taking her under my wing and do some hands on growing ... so to speak. 
..costs nowt........
...an I'll lock 
..Nurture with Care....Grow with Respect....and Don't be Tempted to Over Fertilize.........
