Its too crowded - add a fourth sheet. Move the Weapon / Gear section to the back of the Mode sheet and add more weapon boxes and gear lines, perhaps putting gear into columns with wieght and quantity. Put the Space Marine Abilities box here with the Armour Abilities. This would be a good place for an Ammo types callout box.

Expand the skills section to allow more focus lines (like more than one additional language). Use the back of the first sheet to expand the Talents, traits and Psychic abilities.