Your not half bad at modeling, you got the silhouettes down. All you really need to do is model the details, and push yourself to learn new techniques. There are plenty of tutorials on the internet.
I don't know what software you're using, but it's good to know the pipeline for the software.
And you got blueprints! Hence you got really good modeling reference! So why not do it yourself?
Come on, I dare you to do better!