If you swiped an idea and built upon it without asking for permission OR giving credit where credit is due, you blundered badly. I don't post much, but I read damned near every post about modding here, as I'm tinkering and trying to learn how to create an SHIV version of an uberboat like Mush Martin's for gun action and so forth. The community, as you might have noticed, is very small. It's intimate. And it polices itself.
Ask next time. Most modelers love sharing their work, because most of us love making the game different, better, and more varied.
But to take someone's work and build upon it with NO credit is just tacky.
And with 87 posts to your credit, you should know that.