Hi,
The way our VM Template was designed, the SKU and Manufacturer don't show up.
You would need some custom PHP coding modifications to achieve what you are looking for. Our free support doesn't include any kind of custom modifications.
The PHP line to get the SKU in category browse page is this:
<?php echo $product->product_sku ?>
The PHP file for category browse page is this:
ROOT/templates/<yourjoomlatemplate>/html/com_virtuemart/category/default.php
About the manufacturing info, check forum.virtumart.net or just google it.
About your second issue, add some related products from Product Details page in VM Configuration, then they should show up like you see in our DEMO.