I would refer you to my 1st point, these don't fit with the rest of the Art in the Horus heresy Collected Visions book.
The 1000 plus pieces of Art in the book, these two stand out as being poor representations of the Universe. They don't even fit particularly well with the other pictures in the book (which are pretty amazing actually). Bearing in mind I started
40k in 93, and remember the
RT Marines, I don't remember alot of marines with Lasguns, nor do I remember many with "1940's Field Radio's / Telephones". Nor do I ever remember power armour that looks like a Wetsuit, ala the youthful ultramarine on his VoIP telephone.
If I remember rightly scouts turned up in MILTON BRADLEYS "Tyranid Attack". A now long forgotten game, with Termies and Scouts fighting a boarding action on a Bioship and it was a bit crazy, fun but ultimately a bit weak and was the successor to Space Crusade.
It was then revamped to "Advanced Space Crusade" by Jervis and Co to be a
GW game.
Which was like a Skirmish based with elements of Space Hulk and Space Crusade thrown in. But actually had little to do with its spiritual successor Space Crusade because it played nothing like it.
Anyway back on the subject, The scale of the suits are wrong, yes the Jes Goodwin resculpt changed them but even the old
RT era marines had a nice look to them, they look fundamentally wrong compare to both Modern and
RT era marines..