1) Ref #5 is handled...it no longer exists on the SpaceX site as far as I can tell, so I pulled from Archive.org. Performed lots of other citation fixes, including fixing a couple of URLs that were incorrect. I also agree that the forum cite should be removed...if a replacement cannot be located, the material needs to be excised. In my opinion, all the newspacewatch.com articles should be replaced since they've gone completely paywall (I'll be surprised if they survive), even though I've added archive links to all four of those cites.
2) I'll come back and clean up various conversion issues (definitely SI before non-SI in space-related articles), but I didn't immediately see much in the way of spelling issues. There's some formatting work to be done, but doesn't seem too bad.
3) As for images...they simply don't exist at this point in time (SpaceX is, after all, a private company, and conducts their testing in-house). I'm always keeping an eye out for them, but I don't expect anything until this version of the rocket is used for a NASA mission. However, lack of media should not disqualify the article from any status, even as Featured Article (I recall one last year that was passed without free media). Editors cannot be held responsible in situations like this.
4) I agree that "rocket" could be dropped from the title as redundant. Or, use something like "SpaceX reusable rocket program". Eh? —  (t @ c)