as i said you can either copy it and keep the same name, in which case you will automatically get the dynamic body class of .page-template-template-page-fullwidth-php that will trigger the full-width code in the 2c-r-fixed.css
/*
Full Width Template
*/
.page-template-template-page-fullwidth-php #container {
margin:0;
width:940px;
}
.page-template-template-page-fullwidth-php #content {
margin: 0 0 0 10px;
width:940px;
}
.page-template-template-page-fullwidth-php #comments {
width:540px;
}
OR if you copy it , but RENAME it then you no longer get that dynamic body class. if you have renamed it to homepage.php then your dynamic body class will be
.page-template-homepage-php
you could see this at work with firebug.
thus the above style rules don't match b/c you don't have the right body class.
you'd need to copy those style rules into your own style sheet and use the appropriate body class
/*
Home Page Template
*/
.page-template-homepage-php #container {
margin:0;
width:940px;
}
.page-template-homepage-php #content {
margin: 0 0 0 10px;
width:940px;
}
.page-template-homepage-php #comments {
width:540px;
}