The regular work pit is only 4 feet deep, not very deep, that's the size I had previously and it works ok for me. I have power ran on both ends of the pit, so I will be able to wire up lights.
The old pit did not have problems with water, it was bone-dry for years, so I don't expect any issues.
The second pit is only 16 inches deep for the scissor lift. I should be able to install the lift hydro unit between the legs, in the pit. Wires for the controls (up, down, release) are all ran to a socket on a wall, so that will save some space.
I initially added drains to the bottom of both pits but stupidly I ran all the plumbing UNDER the foundation, about 3 feet deeper than the municipal plumbing system. Good thing for photos of the all plumbing, I managed to direct all pipes outside of the house without much effort.
The silver lining: when drilling for one of the pipes, I ran through some re-bar and later on connected the earth line there. It measured well within spec and it will be much much more corrosion resistant compared to pillars driven in the ground.
Carbide saw got denied when cutting the bricks I used.....