My thoughts:
industrial theme, okay
Remove the portals or change them so they don't look so boxy and out of place; separate them
before you really get into it, take note that they aren't planning on changing their hub spawn...it's already an A+ build on Creative if it was to be graded. if it's just a thing you want to do even so, sure go for it! it's always a great idea to try and improve your building skills. also I want to point out the fact that I'm not trying to shut this idea/your passion down, I just want to make sure you remember how unlikely it would be for Dacon to change the hub spawn before pouring hours into the project.
good luck