I read your article about the 12 plate smack.
It sounds good.
That is a great producing unit.
To seal the lid, plastic tape around the lid and rubber tape over the
plactic tape.
It won't come loose and produces a good seal.
No need to add a filler port, just replenish through the barb with a
small funnel.
If you do another unit, place in parallel and reduce the lye in both
for approximately 7 amps per cell and 14 amps overall.
You will see this to be the best producing unit around and I am sure
you will enjoy a large gain.
Keep us posted on your efforts and gains.