Wow, your area looks cool! I like the structure you already have, and the plans look great so far.
With that said, however, I would also make sure that you’re going to have enough space, especially if you’re playing with tech mods, and it’s better to have more space rather than less. Maybe an underground section of the castle? Also, there’s some room on that mini-island thingy across from the main castle in the second thingy, so maybe a statue/fountain? That could be really cool especially if you go big-ish with it. I also like the build pallette, and I’m kind of excited to see how you’re going to make the Livingrock bricks work - they tend to be too noisy for me to work with.
Anyways, it looks great so far, definitely keep us updated!