Your next trick will be the modeling part. There is precious little software that will let you do a premium crafting of the bill at a reasonable investment. However, a limited time use license could help. The idea is that once you have scanned the bill as an adult (you want to match up exactly) and compared it to a similar adult for features as you so well noted, you need to "model" the replacement. Getting the hang of that type of software may take some learning up front. That gives the bird time to grow up and you time to get good at all these special requirements. However, you may become the only vet that can do this for other wild birds in need of help. I'd say this is a career enhancement opportunity.