Okay, so I got a hold of an actual BtGoA rule book and I studied it a bunch. Here is an update on how I think the Terrain should work to adapt it to this project. Some of this will be similar/the same as what you have already Mithras but let me know what you think.
Also, I pulled the background images from the CA
document. So I am going to organize this into an actual PDF full rules document soon with proper formatting and making it real easy to read. It will take me a bit to do but it will be much easier to read and share when done.
Also, I propose that Character Targeting is changed to make it so a character cannot be targeted with shooting if the character is not the closest unit and within 3" of another friendly unit. This way they need to maintain a semi unit coherency to keep their protection.
Any unit with Sniper Weapon/rules will also ignore intervening units when tracing LoS