Super cool effort :- ). I must have something against houses that are more vertical then horizontal in size, looks so disproportionate, but I am megalomaniac.
I've recently started on ForestPack, and I've noticed it's way more memory hungry than simply using CoronaScatter. Could that be true ? But yeah, easy to fill even 64gb ram with Corona and high-poly veggies.
Regarding foliage, I was happy to find out the values I used for years actually match Megascan ones. But I am still suspicious of the translucency effect and how translucency map should ideally look and work.
I started bothering Jaroslav (Corona material dev) about it recently, but will look into it further once I have some free time. Imho we still not have shader that does simulate greenery correctly. The translucency behaviour is way more complex in real-life.
Of course, gave you a like on Behance :- D