As I've said in another post, I've come close to getting a new design for a cell, modular cell, finished.
So far the idea is basically taking some 6X6IN plates and putting a PTFE gasket around a 1/4IN of the outside. I have end plates that are 1/2IN thick putting the pressure on the cell to hold it together. For water solution deliver and the gas relief there are 1/4NPT 1/4IN Yor-Lok fittings through stainless tubing. I haven't found a pump yet other than using a carb pump for testing. I have silver solder and high temp flux for soldering some solid core ROMEX wire right into the plate, there is a slot for soldering it in place at a corner.
The only thing I need to get to do a test on this cell is some 1/2-13 bolts and a small tank/bucket. I still have to take my plates to a friends house so I can use my sandblaster and blast the plates and solder the wire to them. Right now I have 10 plates for testing purposes but I will probably only use 2 or 3 for initial testing with high strength KOH/NaOH. I want to determine how many amps will be pulled with just these plates, so I can better guage how many I want to put in the car until I get my electronics in place.