Okay, so I've upgraded my machine with another set of statues 50 blocks away (should be at least 35), so 6 bunnies and six fish can spawn at once, three each left and right.
I'm still missing that last goldfish statue, but I'm now making around 80 Gold per minute standing there with my Golden Bugnet, when before I was making around 55-60.
I'm guessing you could get close to 1 platinum per minute with that last goldfish statue.
Here's what you'll need:
* A Golden Bugnet.
* 6 statues each for bunnies and fish (12 statues total).
* 1 bird-statue, some pressure-plates, a 1-second-timer and a dart trap for the bird-engine.
* some cable, switches and teleporters from the Mechanic and Steampunker for the actual machine.
* If you want to use it as an AFK-machine you'll need a third-party-program that holds your left mouse button down. Or just use duct-tape.
The teleporters teleport you back and forth rapidly (which can make you really dizzy), so you can catch the 6 critters each from both sides.
The right switch is a killswitch that gets rid of the birds in the bird engine.
Ignore the green and blue cables on the right, they're for teleporters.