I made some galaxy far far away capacitors from some things I had lying around. 1/2” pvc, hot glue, tin foil and a thin styrene modeling pipe. I cut the pvc into five 2” pieces. Stuffed the middle with tin foil so I wouldn’t waste a bunch of hot glue and save on any unnecessary weight. Filled them to the top on one side and filled them just below the edge on the other side. Drilled a hole in the full side and super glued in my piece of styrene pipe. I sanded the edges down to smooth them.