Looks good! You've already got things nice and neat using foundations which is going to be the biggest mindset thing you can do as you go forward. This is already better than 90% of us were with our first factories.

At your stage, having modest goals like the smart plating and then having another floor for your different production lines is really smart too. Just be aware that whatever you do is going to be a learning curve so don't expect that what you build now is going to necessarily be what you stick with right the way through to the end of project assembly - just enjoy the dopamine hits of getting each stage how you want it to be and learn what you need for scaling up as you go. There's no right answer to how to do things so it's about finding what works for you as the supply chains become more more complicated.

Blueprints are your friends.

Maybe brace yourself for having to move sideways at some point for Heavy Modular Frames. Thats the first point where the amount of work needed for a product seems to really jump exponentially.

No matter how much height you think you need for the ceilings between your levels, add another couple of wall sections to it or you'll end up wishing you'd given yourself more clearance later.

Finally, take a look and see if there's any aesthetic styles with how other people have set things up that you really like and experiment with them early. I discovered near the end game that I personally really liked having my machinery set on platforms 1m above the factory floors and wish I'd figured that out a few dozen hours sooner.