404’s eh? that’s strange. the URL is working for me. hmmm… I will play around with you idea, though it may be somewhat over my head. the CSS side of the plugin makes total sense to me, but the PHP side is a bit messy.
You shouldn’t have to touch the PHP side of it at all. In the WordPress admin, go to the contact form’s settings, remove the default line breaks that are present, and then make sure to override the 100% width of the inputs in your CSS.
With all that being said, forms following your current setup are actually better for readability. Our eyes can naturally scroll down the form without having to also scan left and right.
I can’t see the whole code you posted, you should be embedding it into code tags.
Anyway that’s the idea, you put the table tags directly into CF7 textarea defining your form.
You can put there ids and classes aswell, for styling.