Very nice, although I think I would have manned the drill and told my brother-in-law "Stand right here and look straight up and tell me if you see anything leaking out."
If you decide not to use the block's valve, here was the viewpoint that supported doing that (from a well-respected contributor, BTW):
When the block contains it's own pressure regulation valve (typically set for 55-65PSI), the pump is recalibrated to bypass only at 115-125PSI in order to prevent cold start issues such as blowing pump gaskets or filters.
The benefit of having the relief at the rear of the block is it assures the farthest reaching points in the block have sufficient pressure - important if bearing clearances are loose and a lot of pressure is lost along the oiling circuit.
Since the pump can be calibrated for whatever pressure you desire, and since it is not particularly difficult to determine what the pressure will be in the far flung reaches of the block, there is no real reason to use the block's pressure regulator, outside of the possible coolness factor.
It is quire reasonable to defeat the block's oil pressure regulation valve and use an oil pump that is calibrated to regulate at the pressure you seek.