I saw some video online of the twister HHO cell made with stainless steel cups, and decided to get some to play with. I took 16 of them and arranged them in the same pattern as the plates in the Smack Gen I, and created the Cup O' Smack. The cups are pretty cheap - I think I paid under $6 per dozen - so if they work it might be a way to lower the cost of a Smack. The wall covers are $1.69 each at my Home Depot.

Here are pictures of the cups I used, drilled to take a 5/16" rod, with 2 smaller holes for circulation:

Here are the cups being arranged on the nylon rod. The spacers I used to keep the cups close but not touching were cut from circular grids used in knitting (I guess - I found them in a craft store for $1 a dozen). They come in sheets as well, and I had picked up a bunch when I was trying to run some tests with stainless steel mesh.

Each pair of cups is then connected to the next pair using two stainless steel jam nuts (from McMaster - the same part as the original Smack).

After putting 4 pairs on, I then put on the other lead strap on. My straps are 6-7" stainless steel hose clamps from Lowes (about $1.50 each), with heat shrink tubing around them. They are thin, which is a minus, but they are flexible, which makes it easy to bend them to fit in around the cups.

Here is how the straps connect in the top cup. There is a long one going from the top to the bottom of the stack to act as the strap connecting the two outer plates in the Smack design.

And here is the completed stack, with all the straps wrapped and attached.