The original Airfix attempt was a nightmare. A lot of companies got around it by doing the solid "gun nose" Boston/Havoc. Will yours have the cheek gun pods? I can't see a clear photo of any Bismarck Sea Boston/Havoc to know if it was just Aussie or USAAF birds.
I notice your coloring on the bottom is spot on. That's a tough shade to get right. Top marks for it. It stands out. All in all, a great update.