My last suggestion would be to think about current and trace width. With 5 steppers, a HBP, and two hot ends, you could be running 30 amps or more total. Make sure your power supply connectors can handle it. Also the traces to HBP look a bit thin for 10A. At first I didn't see the separate HBP power supply connector, so you might be good. As long as you have space you might as well thicken up the high current traces.
Also I would probably start a new topic in the main electronics section. This section doesn't get much traffic at all.
Also I would probably start a new topic in the main electronics section. This section doesn't get much traffic at all.