I have done some cluster work. While I am not sure what you mean by cluster I can tell you the true definition of cluster requires the application to have been coded to run on a cluster. WCG is not. WCG is a grid.

I was a Sr UNIX Systems Admin, Solaris, AIX, Linux, FreeBSD and SCO. I'll help where I can and can do some research for you if you define what exactly you want to accomplish. There are cluster like tools where you can issue commands on one machine that execute on others. But they are not a true cluster just control and management tools for multiple machines.

My plans are to try and setup a group of diskless machines running Linux that are all controlled from one machine all running WCG. But that is still not a true cluster.

Hope my explanation helps.

I love the stacked cubes idea.