Well, I have found some Miura statements from the Berserk Ilustration File interview; if I manage to find the rest, I'll post it here.
"The most disturbing parts of my story are taken from the high medieval period, while those that confer a glorious impression are drawn from the period represented by Versailles. They are different epochs. To come to the point, I have created a new period by uniting diverse characteristics of the Middle Ages, from its beginning to its end. At the start, I thought of having Gatsu wandering through Europe during the period of Dracula and Joan of Arc, but I abandoned the idea because I decided that creating a story that followed real history would limit my imagination."
"I insisted strongly on the idea of the giant sword, and I carefully designed the arm cannon, which at the beginning was going to be only a crossbow. The image of a warrior with only one eye is pretty common... but the great sword and the arm are my own touch. I belong to the generation of Hokuto no Ken, when, rather than the development of the story and the characters, it was a priority to create something unique. I thought about it a lot, and finally I got the idea of creating something gigantic, that is, an enormous sword..."
"As far as the battles, my idea is that Gatsu and his sword should be able to beat anyone with just one blow. I considered this image most important, even if someone could protest that my combat is too unreal. I sought to be spectacular, even if I will never put in a leap in the air like in Kenshiro...(he says this with a laugh) "
"I get up at seven or eight in the evening. I start to work at eight-thirty or nine. After some work, I eat and start again. The next break comes at three to three-thirty. At six in the morning I eat my last meal of the day (day?!) after which I work until midday. When there's a lot to do, I work until two or three in the afternoon. I live like a vampire, but I often think I am cut out to be a comic writer as few others are: I don't have any problem with a hard life without vacations, because it's orderly, but I have trouble concentrating during difficult periods."
This statement, instead, is contained in an interview on the magazine "Jappamondo":
"The information that we have in Japan on Western fantasy is a little strange. The Japanese are without a doubt the Asian population that most likes European fantasy... Most Japanese children have more familiarity with knights in armor than with samurai... Fantasy corresponds to magic of the sword. I also, as far as I can recall, grew up with this vision. In designing my manga fantasy, I want to create stories that make the reader a participant. When I examine the sensations that make up the story, I find myself naturally in medieval Europe. Naturally it isn't the real Middle Ages, but a false image, recreated from Europe at that time, which wins great success today in an Oriental country like Japan. Probably, samurai or ninjas designed by a Westerner would seem bizarre to Japanese eyes, but perhaps the medieval world of Berserk appears strange to Western eyes, isn't it so?"
OK, that is all: enjoy!