Hmmm,....
I think yes... code without style can effect to the whole project. For simple project, the effect is almost none, but for large project, good coding style will help you...
We, human has limitation remembering code flow, by using good coding style we can easily read or remembering the code, so we can easily organize it. If you work as a team in your project, good coding style will be big issue.
Say that you work as a team in a project, you and your member have different coding style, you code with your own style, and so they, because the coding style is different each member has difficulity read another member code... so the the project will be messed...
Hmm,.. maybe you should try coding first...
try make a code with and without coding style, and then compare it...
you will find that coding style is important...
Hope it can help you...