I rebuild this one too. My baseplate looks similar to cathars, but its not build that accurate cause I dont have a mill, only a saw, a drill and two hands...
To prevent the streams from interfering with each others it tried to have little channels between the holes. the water will get into them after flowing down to the baseplate and leave the block through these channels. (I hope it will do
).
I used copper for the whole block, so its quite heavy (more than 500g). Gonna test ist this evening.