I got the opportunity to write a breakdown article for the great Experience Points community.
https://www.exp-points.com/
You can check out the article here: https://www.exp-points.com/wouter-overgrown-forest-gates-in-ue4
I go over every aspect of the environment, from blocking out, tree creation, lighting, utilizing Megascans, Houdini simulations and much more! Hope you enjoy it!