To prevent further necromancy i've not even checked if this has been answered before...

So, how do ya figure this works for say a Speesh Mahreen in power armour?

He has at least Unarmed Warrior and are wearing Armored Gauntlets, should said astartes get a dmg boost to his unarmed attacks due to the gauntlets or not, +4 being the deduced dmg bonus?

The way I see it Unarmed Warrior & Unarmed Master are improvements in technique while Gauntlets are a dmg booster like Iron Knuckles. Getting hit by a bare fist from a martial artist hurts, said martial artist using knuckles will most likely hurt alot more.

Also wondering if perhaps Unarmed Masters should be able to Parry armed attacks against them... Would make sense in some cases at least...

Thoughts?

They do nothing for a space marine in power armour. Unarmed Warrior already enables them to do more damage than what an armoured gauntlet allows (1d5+1, Primitive 6 vs. 1d10, Primitive 7 & immune to Power Field parries). Not to mention that the gauntlets of a power armour technically are armoured gauntlets.

You can't parry. It says so in the Natural Weapons trait.

Maybe should have put this in House Rules instead... Since I already know what is being said as per the Core rules, but I find em lacking.

Since I do find that someone should hit harder while armored than not armored, since a gauntlet is better for crushing peoples faces than bare fists and yet the same techniques that makes a heretic deadlier in bare hand to hand fighting could be applied to when being armored.

And yes I do also know that one cant Parry as per rules as written, just do not agree with it since the purpose of said martial arts should be to overcome armed opponents. Also think that in (some of) the other 40k RPGs one could Parry while unarmed with those talents no?

Do you not realise that what you're asking for is already happening? Power Armour (i.e. armoured gauntlets) gives extra damage due to the strength increase.

But would carapace guantlets, ie the armored gauntlets of a carapace armor?

Besides, your gripping power has very little if indeed nothing to do with the amount of force a punch connects with.

So the Strength increase of a Power Armor has nothing to do with the gauntlets being armored or not. In my experience the amount of force you generate for a punch depends more on your hips, back, shoulders and to some extent your arm muscles with the fist being the blunt instrument which inflicts the damage.

So you're saying we shouldn't add the damage from the strength increase to weapon attacks because you're just swinging the weapons? That's just silly. The Power Armour strength increase is essentially mechanical muscles. It's a common aspect of the powered exoskeleton.