Im still building the actual castle, but i've got the entire castle walls DONE. But I need to study the actual castle in-game a bit more before I begin making the blockland version. And no, I didn't duplicate anything, I didn't get the new version of the duplicator due to it didn't work. So I had to make the castle walls manually.
Main over-look of castle

Front gate from inside of castle walls

Inside Front gate doors which lead to the top of the castle walls

Top of castle walls (still in progress)

UPDATE:
new shorter castle walls

front of first floor

another over look of castle

stain glass windows :D

rate x/10 for so far progress
unfortunately my mouse well has broken, so i cant paint or scroll through items or bricks. so i temporarily have to stop building the castle for right now. i will continue building once i get a new mouse