One of the things about the Aubrey/Maturin novels is that in addition to the detail and authenticity, the writing style is particularly notable for being unusual. If you didn't know any better, you'd think they were written a century or more ago, as the style compares to writing from that period in many respects, especially the structure.
So to pull the same thing off for WW1, you might have to write something in the literary style of
Flying Fury or maybe King of Air Fighters. That's something notable about WW1 autobiographies too. Some of them have a very 'old fashioned style' about them, whereas others seem almost modern.
Bill Lambert's Combat Report does not seem like it is someone talking from the same era as Flying Fury for example, although some of that might be the difference between a Brit and a North American. Of course some of it too is down to the fact that a few were written in WW1 and others were written much after, but I have certainly noticed the difference from having read many of them.
Al