Kumaran,
Here is the slots that I am using to connect the plates with ordinary car connectors:



And this is how I connected the plates in the first tests, making five 6-cell compartments in parallel:



The red leads are the + and the blue ones are the -

I did not drill small holes in the plate bottom for electrolyte leveling, I can do this whenever I want because with this design, assembling and disassembling is easy and fast. I have four 8mm holes in the upper plate part and if I want to level out the electrolyte, I just tilt the electrolyzer till the electrolute can level out using one of these holes.
I did not measure the voltages across each cell, I just observerd the readings on my variable power supply (30V 20A max)

Thanks,
Jetijs