I did just turn the render icon off after but it still trying to add the AO onto the turret and barrel, am I missing something here?
https://drive.google.com/drive/folders/1zw43trtBtnt_yxJP0O6yhPAJG_DYnMXG?usp=sharing
It looks like you have the AO for the body of the tank looking good, so now you just need to make the turret and barrel rendered and turn off the body and bake again. Just be sure Clear Image is checked off so it doesn't overwrite what you've already done. You might find though that your UV's are too close together, and the 4px margin will cause some overlap. Try scaling down all of the UVs at the same time by individual origins to fix that.
Uv's were a little squished so scaled them down and it has worked :).