It wouldn't be bad if you could pour ten or twenty
bricks at a time.
I followed your procedure and marked a fill line on a plastic container to minimize refractory waste.
I use a graduated glass beaker to measure the 230 ml of water needed for each batch.
Tracking the time it averaged out to 5 man hours per set of 14 bricks.
Most of the time is spent cleaning up the molds and tools between pours, the actual mixing and pouring goes pretty quick.
I would like to make a set of molds for the Glenwood #8 bricks also provided I can find a decent upper and lower brick to use as a master.
I'm sure you agree 1/32" off in any dimension makes for a poor fit.
Paulie