Ahh, having a quick look around looks like I may have followed a corne build guide but just made sure I had choc stuff instead. (Don't think there was an actual choc variant of the corne at the time).
I bought all of my parts here: https://mechboards.co.uk/
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The machine pin socket was to hotswap the controller whilst also giving storage for the battery underneath. I think I followed a YouTube guide for that one. It's not something you need to do though. If you are thinking of that and can't find the video yourself I'll try and look around for you.
But yeah if you give me an address I'll try and see how much the postage will cost for you, and I'll try and find where I've put them too. So don't buy any of the extra parts until you know for certain I've sent pcbs your way. Just in case I don't find them. Slim chance, but you never know.