Something I've been wondering: do you think that a person with very minimal tools can make costumes like these?
Not at this level, of course, but something that could be of passing quality? I have a sewing machine, some skill sculpting and an idea, but I imagine there is a steep (and unforgiving) learning curve with this.
you are probably not gonna succeed the first time, but there are people who make instruction videos on youtube, and a lot of people who make these suits also sell stuff like jaw setts and pre-made eyes, that might help I think you should do it, with a little practice you might be able to do really well!!
Not really, no. From personal experience, I only notice restricted airflow when I'm really exerting myself, such as when dancing or running (usually what happens is I just get tired faster). Otherwise I don't notice much of a difference.