Given Fulgrim's current chaos affiliation, this would actually be within the realm of canon.

Looks like a themed collection, so pooled.

Power armor with a boob window? Sounds silly, but this is Fulgrim we're talking about, even before chaos corruption....well yeah it still makes sense, for Fulgrim.

"Mhmhmhm, you have NO IDEA where the shaft of this blade is going after this battle~" Primarch Fulgirl