I've managed to design my very first pcb. It's a sensor board, with room for an atmega328 and 3 analog inputs, as well as a status LED and a 2x4 pin-header where is meant to go a nordic transceiver breakout module.
Very interesting. The first dedicated board I have seen and, if I can be sure of the Nordics delivering the goods, I am looking at doing pretty much the same thing.
Quite apart from the extra cap etc., I wondered about avoiding some of the through-board transitions. UI assume the large rectangle at the top is a regulator and can be rotated, and the nearby terminal can be reversed.
I submit the diagram below as intellectual exercise...
I would be interested to see how you finish up with this.