Actually the thread you link was my method to install Snow Leopard client into Parallels. Why Snow Leopard client instead of Snow Leopard Server?
Because "in those days" Apple sold Snow Leopard client for $19.99, while Snow Leopard Server was $499+!
Why? Because Parallels comes with instructions to easily install Snow Leopard Server, whereas you will see from my old thread, I have to use a shoehorn (Terminal) to get Parallels to accept Snow Leopard client.
There was a common Urban Myth that the Snow Leopard EULA prohibited the virtualization of Snow Leopard client in Lion or Mt. Lion on a Mac. Apple sat by quietly (and perhaps even with a smile on their face) as its shills propogated that myth, which of course resulted in the increase of sales of Snow Leopard Server.
The thread you link was adopted by others to formulate instructions to install Snow Leopard client into VMWare Fusion (and perhaps VirtualBox, as well). Faced with the fact that there was an ever increasing amount of users that would access Rosetta in Snow Leopard client (consistent with its EULA), Apple finally threw in the towel and dropped the price of Snow Leopard Server by 95%; to the same price as Snow Leopard client - $19.99 + sales tax & shipping.
Now that Apple has decided to help those who need access to Rosetta in Lion or Mt. Lion, by dropping the price of Snow Leopard Server to the same price as client, the easiest approach is to just purchase Snow Leopard Server and install it as per the instructions provided by the virutalization companies, in my case Parallels.
Of course, if there is a Windows version of a game available and easily accessible, another approach is yours: simply obtain a Windows copy of the game and run it in Bootcamp or virtualization, such as Parallels. This would be another approach, and for graphics intensive games, the Windows version in Bootcamp may be the only choice.