Hi Don,
6. What are those 2 electric lumps for in the opposite corners of the forward bulkhead used for?
If you mean electric pumps in the forward port and forward stb corner of the Diesel engine room, the one in the port corner is auxiliary/emergency lubricating oil pump (and transfer fuel oil pump). This pump was used to force lubricating oil through all friction surfaces of the engine, before it is started up (and when the individual lubricating oil pump driven from the crank shaft is not running). Of course, it was also used when the crank shaft driven pump is out of order.
When used as fuel oil transfer pump, this pump transfers fuel from external fuel oil tanks (tankers, depot ships and so on) to the boat's fuel oil tanks.
In the stb corner is the auxiliary cooling water pump, used when the individual cooling pumps driven from crank shafts are out of order and to cool down the diesel engines after they were stopped (and when individual cooling pumps also were not working).
These pumps are vertical shaft, centrifugal pumps. The parts visible above deck plating are the electric motors, the pumps themselves are below deck. Such arrangement (similar to all other pumps) is to protect motors from splashes and water (even if pumps are flooded due to high water level in bilges, the motors are safe).
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Regards
Maciek