The pipe idea WAS a good one...haha
Seems it would run $50+/- just to get the pipe.
I picked up a dumbell set from a yard sale once, it came with aluminum handles that slip over the bar, then has to washers that slide on next, then you add the lbs, that would work well for my tube idea.
Did some searching, for about the same money, I can get pro style dumbell handles, the ends screw into the handle, and are specific to a short range of lbs, otherwise its sloppy, same things used in gyms. I thought, I could get one of these designed for 6 plates per side and simply make wooden spacers to replace the plates, to keep the plates snug.
Im trying to find someone that has a starter weight set, you know the kind with the cement filled weight, if I can get a barbell that comes with that set, cheap enough, I can cut it to length and Im good to go. So far no luck, I have one but I used it to make my pullup station...can't live without that and I like it the way it is.