Wow! That's an impressive collection of Steck! And only the four tall windows are customised parts?
Yes Graham, only the 4 tall windows are 3D from Playmoebius, I bought them specifically for Hogwarts main room

The rest are original Steck, no idea where I got all that over the years. Plus the 3666 and the other smaller ones, those are on separate boxes...

I think I should probably be scared that I have every part there but the special tall windows and maybe a couple short on the double arch walls. You didn't show the greenhouse parts.
I have seen a couple of the movies but not read the books actually. Something to think about doing if I get bored with not enough Playmobil to keep me occupied. Heh
Someone said “there is never enough Steck”, no worries…

The Greenhouse was packed along with the accessories and figures, I didn’t photograph those, but from the greenhouse set I used only the main building with the roof + sliding doors …I would need about 10 or 20 greenhouses to achieve something similar to Professor Sprout's herbology class from the movies, but I only have one…

"Three times a week they went out to the greenhouses behind the castle to study Herbology, with a dumpy little witch called Professor Sprout, where they learned how to take care of strange plants and fungi, and found out what they were used for."
— Harry Potter (from harrypotter.fandom.com)
Thanks for sharing 
I LOVE making ofs...
I think we (ok, at least I) don't realize the amount of parts we use in a building...
Hope you took more pics of the construction... or you have a better memory than me. Then again, this IS steck, so may be doable from finished building pics 
I took many pictures because I do wish to build it again some day. When I’m old and have a house by the sea with green shutters on the windows facing the garden and a big attic to display my playmobil collection…. Oh well. I keep on dreaming
