Alright! I got it to work. It was indeed the ‘Get Assets by Path’ that didn’t function properly, as in not finding the assets. Because I didn’t use the assets it is finding it didn’t package it along, so I had to make sure to cook those in too.
So what I did was go to Project Settings > Packaging > Packaging > Advanced > Additional Asset Directories to Cook and insert that directory of the parts (both mesh and icon).
Whilst I found some ‘solutions’ online, this method I find the most simple (but would also assume it’d be ‘heavier’, but don’t quote me on that)
I hope this can also help others resolve the same issue