There are a lot of good cutaways out there. Try searching Google for "WW2 aircraft 3-view drawing" or "WW2 aircraft cutaway drawing." A LOT shows up, then look for the ones that are larger than 1 or 2Mpixels for better detail.
Tomo is a really great forum resource. He comes up with stuff that is amazing. I wish I knew how he FINDS that stuff he finds.