Thank you for your message.
I've been dealing with SKU's and their document types. Apart from the limitation of having this in multiple cultures there is yet not a relationshipt between them.
However if you only need to get the URL to the product page you can use the SkuID. I manged to get the link with url in the following way:
string productUrl = "<a href=\"" + ResolveUrl("~/CMSPages/GetProduct.aspx") + "?productid=" + myProduct.SKUID + "\">"+myProduct.SKUName+"</a>";
Given that the myProduct is the SKUInfo object which you currently have.
Let me know how it works.