It uses the same styling as WooCommerce built-in Product List widget.
The products being displayed in the order they are entered in ID input field...
Upload the plugin files to the wp-content plugins woocommerce-custom-products-widget directory, or install the plugin through WordPress plugins screen directly..
Activate the plugin through 'Plugins screen WordPress.
Add the widget using Design->Widgets screen...
In Products->All Products screen, hover over product to reveal its ID below its name.
Do not use SKU, but WordPress ID...
The widget is constructed with the custom class custom product list widget, which you can target...
Yes, it implements the same filters as WooCommerce Product List widget, namely woocommerce products widget query args, woocommerce before widget product list and woocommerce after widget product list.
Interested in development.., check out SVN repository, or subscribe to the development log by RSS...
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