So, checking out someone's fav on DA, I stumbled upon this beauty

It is a concept piece based on varied descriptions of the "Stormbird" from the Horus Heresy series. to quote the artist:
In the first Horus Heresy novel, Dan Abnett introduced the Stormbird. Unfortunately, beyond some vague descriptions that vary wildly between the multiple authors of the series, no-one knows what the Stormbird looks like. There's no art and definitely no minatures of it.
Surely there is someone who has completed a large flyer conversion, so I ask them:
Would a total scratch-build based on this concept art be viable?