It seems I can’t edit the original post so I will add some updates here. I am getting rather close now! I have my board and all the electronics. I just need to drill a hole for the wiring and put in mounts for the electronics enclosure. The electronics will be pretty quick as they are mostly just plug and play. Here are some pics:
This is a hobbyking yep 120A ESC with a modded heatsink. I’m hoping it will hold up! It only set me back £58 so its not an issue if it doesn’t!