This is what model railroading is all about; taking off the shelf items and modifying them to meet your needs. No complaining about the manufacturers not getting all of the details right or not making a particular paint scheme. You have done an excellent job of creating one-of-a-kind pieces, and you should be very proud of your work. There is a sense of gratification when you watch pieces running on your layout knowing that they are unique.
Keep up the good work!
Tom