Nicely done, impressive effects, looking forward to seeing what the full Axanar film brings. My only critism is the shots showing D6's(?) at nearly ground level! Seems strange as it's not till Voyager that atmospheric handling is supposed to be designed into Federation starships. Not saying the D6's are landing, just the concept of starships well in atmosphere is not in my ST worldview!
^^^
I suggest you go rewatch the opening of the TOS episode "Tomorrow Is Yesterday" (either the original or remastered version); as it clearly shows that Federation Starships can maneuver in habitable planetary atmospheres.
As for my thoughts on "Prelude to Axanar":
- The opening credits stated it was 'Part III'...what happened to Parts I and II?

(Yeah, I would have loved to see those

)
VERY well done on every level. It's the best Fan-made production I've seen and the writing and execution were marvelous. I love all the Easter Eggs and nods to prime TOS continuity, as well as the nod the the era depicted in the Abrams films. It was fun to see that era in the 'Prime' universe.
I've seen people giving some of the acting a hard time, but honestly, this was right up there with the 100% Paramount made episodes/films. Personally, I thought everyone did a good job with what they were given; and I liked what they were given.
Hell, even the Klingons (including the Klingon Empire's overall motivation and actions) were well explained and plausible. It made the Klingon Empire appear as a scary and formidable threat (something that honestly wasn't done well throughout most of the original 'Star Trek', the TOS films, OR in many of TNG Klingon episodes. TNG especially portrayed the Klingon Empire as NOT interested in new tech (or maintaining their ships at all); and here we have an Empire pursuing new tech to further its goals - and a Klingon Fleet Commander who knows the value of a well engineered weapon. IMO - the 'Kharn' character as written and portrayed sits right up there with the other great Klingon characters introduced in TOS, such as John Colicos' 'Kor' and Michael Ansara's 'Kang'.
I REALLY enjoyed Prelude and honestly do like that it just set up the main story of the 'Axanar' feature film, and just gave more background about the entire conflict and set up the 'Axanar' story without really giving any spoilers away (aside from the few main characters we know survive - but hell, when watching 'Star Trek', you knew none of the main recurring characters would die - the interest was watching how they solved the problems/issues present in the episode of the week.)
IMO - Again, great job. I really hope the various Kickstarters are successful (and CBS doesn't decide it goes to far/comes to close to a 'professional' project that they decide to issue a C&D order, or worse), and we get to see the 'Axanar' feature film.
From what I've seen so far, I wish CBS could/would find a way to recognize and include this in Star Trek's 'official' prime continuity officially (without harming their rights to the IP; or having to bring any sort of legal action against the makers of this project.) This whole thing has got me as excited as I would be for any 'official' Star Trek film/TV project from CBS/Paramount.