3 in 1 Featured Page Widget Code?

You can:

1. Duplicate the code from the front-page.php file

or

2. Add the same class home-bottom to the PHP code you added for the new widget like this:

'before' => '<div class="home-bottom widget-area"><div class="wrap">',

3. You should also be able to simply add 6 featured page widgets to the same home bottom widget area without adding a new widget area.( untested )

The class generated by the PHP code for the widget uses CSS on line 1333 of the style.css to display each widget a specific width like this:

.home-bottom .widget {
	background-color: #fff;
	border-radius: 3px;
	border: 1px solid #ececec;
	box-shadow: 0 1px #ececec;
	float: left;
	margin-left: 2.564102564102564%;
	padding: 40px;
	width: 31.623931623931625%;
}

.home-bottom .widget:nth-child(3n+1) {
	clear: both;
	margin-left: 0;
}

Yes, no need to add a hook. Simply duplicate the code for the widget area in the front page file.

Add the code directly to the front page file rather than the functions file.

genesis_widget_area( 'home-bottom-2', array(
		'before' => '<div class="home-bottom widget-area">',
		'after'  => '</div>',
	) );

And register a new widget area in functions.php

genesis_register_sidebar( array(
	'id'          => 'home-bottom-2',
	'name'        => __( 'Home Bottom 2', 'enterprise' ),
) );