LEDs don't share very well and a 500 ohm resistor will probably get quite hot. You could get around this by running the LEDs in series so the power goes through the resistor then through one LED then the other (facing the opposite way). This would also save you four connection blocks. Test it before building.
One board would be fine but to make it easier and clearer to understand and work with if you cut your schematic in half vertically and swap the sides. This will mean the power lines would be down the centre and the outputs on the outside. Then there would be less crossover of tracks and wires.
So looking at the board it would be power in the middle, resistor network then outputs at each edge.
Tony
https://ozfreemo.com
https://adelaidemodelrailroaders.com
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