Heyo! I just created an account and wanted to let you know that I'm cooking up a rebalance mod that puts in cut content (weapons, aliens) still present in the game's geoscape.xbg file:
Zombies (recolored by me)
New Eagle HWP
Y'all should also check my first mod out: https://steamcommunity.com/app/1049850/discussions/0/3380536561724370257/
It adds, among other things, missing alien armor stats from UFO: ET Gold
You don't need to start a new game after installing it, but I'm not 100% certain if you get the Iron Rattler research project.