Nice idea, but the execution is far from perfect. For one thing it shows two tubes entering the host, which not only contradicts everything we've seen in the movies, but is entirely superfluous. Blocking off the nasal cavity entirely and feeding air through the mouth is more than sufficient. Also, specifying O2 on a lot of the sections is wrong. The facehugger detects the hosts natural atmosphere and filters whatever that is in through the surrounding environment, otherwise they'd be restricted to oxygen-breathing hosts only.