Armor variants for Imperial Stalwart

Paleo Miles, the Paleo Knight

I loved the armor of the imperial stalwart by Barbara Brundon, but neither she nor anyone else made any variants for it. Since it is heavily based on Warhammer 40k's space marine armor and they have many variations (tactical, heavy intercessors, terminators, bladeguard, etc), I'd love to have some variations of it to enrich my sci fi settings (especially the helmets. Some inspired by the astartes and others by Halo's Spartans' and the Doom Slayer's would be great).