diy battery end-caps

I designed these battery caps for my copper aluminum saltwater battery cells.
to make a cell you need:
1. soda can
2. copper wire
3. paper towel
4. saltwater
5. electrical tape

to assemble the cells:
1. prep the cap, and put the copper wire in holes in the cap
2. cut the top off the soda can then cut down the middle to make a sheet
3. sand the inner side of the sheet
4. coil up the aluminum sheet so you can fit one cap on
5. rap casing in electrical tape halfway to secure the cap
6. stuff paper towel into the battery casing
7. saturated paper towel with saltwater
8. place the other cap on the other end then rap the rest with tape