Piggybacking air tanks

I currently have a 5hp 60g compressor with a proper distribution and treatment system. I recently took a 30g compressor from a deadbeat customer for partial payment. I would like to incorporate this into my system for more volume.

The 30g compressor has threaded bungs that are smaller than the output on my 60. There's plenty of meat to drill and tap though. Is this as simple as I'm picturing it to be? Just run the output from the 60 into the 30, and then from the 30 to the distribution piping? Seems like a no-brainer, but want to make sure I'm not over looking something.