Inserters can only place on a blank spot on in a storage space. I suggest you box in the spot so the new can't move therefore no new pieces can be placed.
If that doesn't wory try using an underground belt to split it in half.
Enemy base looks inefficient and should be easily bottlenecked. Would recommend building a more efficient factory to counter his. Also, automate more pieces than just pawns - they might use a lot of red circuits, but you'll need the reds later anyways so you might as well automate that
It's fine. Just look at leveraging your generational wealth and other inherited privilege to outpace the challenge curve. Just, don't be too white, please. ^ew