This looks cool, I can see you’re a talented builder indeed.
Here’s some things that I notice/would do.
Firstly, I noticed that your outer walls (for what I can see) are made out of wood. The white/grey patterned bits I believe are one of the choices of walls when you make them. Though I do have to agree it looks very cool, thinking about it wouldn’t make much sense, as a horde of enemy goblins would technically be able to just set fire to it. Though that’s more a case of ‘realistically seen’ than 'Yo your goblins will fuck you up in this game if you don’t do this".
Then, next up, looking through your plan a bit, I notice two things that are missing.
So, if you look at castles etc, you will notice that there are wells inside the castle, so creating a well or two (even though they aren’t practical in-game) would look cool and more believable. Next to that, a market square perhaps? So you’d have a bit of a open area, surround that with buildings for crafters, and build a little market there. I think that would add some to the build.
Don’t get me wrong, I think it looks bloody fantastic. I can see quite a bit of detail in the build already and would like to see the final build. These points are just some things I hope will help you get to that final point
Lastly, something that I notice a lot whilst building bigger projects, and you may notice as well eventually. If you have a single template/building that’s quite large, and you try to edit it by placing individual blocks or changing the colours of those blocks, it may take a while sometimes (think like a second, or a few) for it to update. In that time, the game will freeze a bit and try to process what you just did to it.
A way I noticed to counter that is to break up bigger structures (for example that wall of yours) into smaller structures that are build against one another. In the end, you won’t see the difference, but it will make your life a lot easier when building larger things xD