Stunning model! I hope you leveraged the use of components in this one! Seems like if it was done right, it would be a big file, but no 80Mb...
but who am I to judge?! I've never built a castle like that! 
I'm sure if you showed what you've done to people that care about the castle you would find it of great importance to them.
If they're in the mood to think, or listen.
guessing SU2KT could export this to Kerkythea, and you can use layered/procedural textures with it, and instancing brush for vegetation... and it's free.
surprisingly, my knowledge of Estonian cities is lacking.

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