A train hunter is not a super muscular person. With the Dwarf caseless that true with nearly everyone of them. It just 2 origin that are not the norm. You have the skill but you still a normal person. Not even the elves are super muscular and they can use 2 handed swords.
Hawke enlisted in Ostagar but one look at him topless and you can see he/she is not super muscular. Athletic yes but not super muscular. Athletic does not mean muscular.
Sorry but you are placing too much of a high expectation.
I was very vague using the phrase "look the part" just to avoid this particular response. But rephrasing again, I said that athletic and muscular are good enough for me to be used interchangeably because it allows me to keep my suspension of disbelief. The fem qunari build bothers me enough to make me notice. That's a problem.
Both Hawke genders may not look the part too much naked because the game uses 1 body type for all the characters. I can understand this. But with clothing and armor they look fine. Check the character selection with the champion armor for all classes and you can see what I mean. You can't possibly think that the characters are too "anything".
But the female qunari with our current info, even over clothing and armor still looks odd to me. That means that this is their vision. I don't like their vision, next topic.
Tbh, I dislike the glimpses of human male I've seen. The guy looks very thin. But I'll reserve judgement cause perhaps it's that hideous helmet he wears all the time that makes him look funny. The best protagonist I've seen till now by a mile is the dwarf male.