It's an interesting looking site, I have been looking for something like this for a while to keep a record of my TFs.

I suppose I'll put some feedback.
Well first off there's a bug with the drop down boxes for line and class.
The line box has a habit of resizing itself over the class box.
What I recommend is make all three boxes (Manufacturer, Line and Class) the maximum size they can get to rather then auto resizing.
That would be 15 characters long for Manufacturer, 27 for Line and 20 for Class.

Maybe also an option in settings to choose how many pieces per page you want as a default.
But it looks like it's coming along nicely, it should be great when it's done