Hello, I don't speak Japanese but am very interested in weight reduction too and I like what you've done with your GDB.

I wanted to ask, did you notice any problem with chassis stiffness when you replace the front windshield with Speed Glass?

Thank you for your comment. Since the body of GDB is solid, there was no problem with rigidity.

Thank you for the reply. I learned a lot from your blog and hope to see your car in action again!