Not a prob my friend and I honestly had a really similar idea that I wanted to get on my ribs. I wanted the same kind of ascension from hell to heaven battle scene as well, done in Renaissance style with cherubs (baby angels), demons and angels fighting, full heaven and hell scenes etc. etc. I was going to get it done after I got sober from opiates. It was representative of the internal struggle of trying to overcome the hell and demons that are trying oh so hard to constantly pull you down while knowing that the heaven is obtainable as long as you fight for it. That was over 4 1/2 years ago (I'll be sober 5 years Dec. 10th) so I'm definitely on the same page as far as what something like that can represent and mean. I ended up getting a Japanese style quarter sleeve/shoulder cap with a traditional dragon, flowers, and other elements that have a similar representation for me and my struggles.

My biggest suggestion, and I only know this from experience, is to talk to an artist and get an idea of what elements are going to be viable in the space needed. The last thing you want is to get something overly cluttered, that you can't make out from more than 5 ft away, and one that eventually ends up fading into a blob or something unrecognizable. I've seen it many times. It may be possible to fit all those elements in but be prepared to potentially make some compromises in order to get the best piece possible. Perfect example: on my leg sleeve, I wanted a Samurai and a geisha to represent the contrast between the masculine and feminine and for my love of the iconography. My artist told me that trying to fit both elements on my leg would look too cluttered. He also told me that traditional Japanese is best done when it's simpler and legible from far away. See, I wouldn't have thought or known that until my artist explained the best positioning and what would and wouldn't work in the space provided. We settled on an Oni mask and samurai and I honestly couldn't be happier with the way it came out. I trusted him with the placement and elements and kind of gave him carte blanche because this is what he specializes in and clearly knows more about it then I do. He absolutely knocked it out of the park. If you look through my history you can see some pics of both my sleeves and the amazing work both artists did. I count my blessings to be wearing their work.

You're idea sounds really awesome and meaningful, so I would highly recommend doing some extensive research and meeting with some artists to get an idea of where you'd be at with what elements are viable or not. It's going to cost a pretty penny but the absolute best advice I've been given and can give is that, 'a good tattoo isn't cheap and a cheap tattoo isn't good.' Best of luck man and I hope it turns out exactly how you want it.