Ive actually got a system for converting 40k stats into basic Dresden abilities using certian values as the base line for having powers. Remember this is in- universe and the Dresden system only has three levels of strenght speed toughness and recovery. This means that something as epic as space marines seem to have a rather mediocre set of powers, but thats do to having to have tyranid behemoths and c'tan gods to work into the same power system. So heres a rough 40k space marine
Space Marine
-1 hulking size
-1 Supernatural senses
-2 Inhuman Recovery
IOP Power Armor +2
-2 inhuman strenght
-2 Inhuman Toughness
It is what it is- armor 4
Basic Gear
bolter weapon4 30 shot clip or bolt pistol weapon 4 10 shot clip and chainsword weapon3
grenades weapon 4 zone wide
Throw in gun and weapon stunts, apropriate for an extremely trained warrior whos been fighting and training for decades if not centuries. Skills should favor high weapons, guns, conviction, might , and fists.
So essentially the gear stunts and skills make the hero in 40k. An ork boy has a similar power set but its lacking the armor and quality weapons and high skill set. Translating this to actual Dresdenverse is a challenge i havent gotten to yet.