I've been caught up with work, and will download the test server overnight... Is the helmet still available if I test?
I think you're good if you do testing up until it gets released. If not, someone (Radar I think?) said you'll be able to earn the helmet in the future as well, even if you miss out on it this time.
No problem. There's been some long-running battles on test around the Crown/TI alloys/Allatum biolab area, so I'd check those for fights so you test stuff out.