Here is my application:
Which castle are you using Amboise as inspiration for? Brightwater?
For the other two, it'd only be good in it's 13th-early 14th century form.
Loving the development of terrain and just as further recommendation, I'd suggest placing the forests only on hillsides or difficult terrain to cut wood on, and having managed copses elsewhere on flat ground.
It'd help give the feeling that the region hosts a very large population centre that'd consume a huge amount of wood and so the best quality resources in accessible places would have already been exploited.
I’ll take this into consideration for Brightwater.I would make an argument for a proper godswood in BWK as opposed to a garden. Godswoods would be signs of heritage and wealth, and all canon indicates houses try to have them whenever possible. The Arryns attempted to put a weirwood in the Eyrie despite being fully Andal, a godwood was put into Harrenhal despite the Hoares believing in the FotS, the Targaryens put a godswood in the Red Keep despite having no connection to the First Men, etc. The fact that HIghgarden and near every other great castle in Westeros still has its godswood is a sign that it's fashionable. Also the Florents are known for claiming their First Men heritage and connection to the Gardeners as why they are more fit to rule Highgarden over the Tyrells; a godswood would show this lineage. IMO the only places where not having a godswood would be common are places where they're unable to grow or were conquered by Andals, neither of which apply to the Reach.
On a more meta note, this server focuses highly on realism over fantasy. Godswoods are the one canonical aspect of castles in ASOIAF that make them purely Westerosi and not just European. They are a way to undeniably tie castles to ASOIAF and I think that's a good thing, especially for an important castle like BWK.
What's your plan of work? I would heavily suggest doing one area at a time.
Very much happy to approve, provided you ask before any major change to the initial plans. Good luck, make the Reach proud!