Actually, RLG, in my experience, it's difficult to get boolean operations to work in RDS. It can be done, but you're likely to get freeze-ups. Here's what I'd suggest. Export your free-form object into the vertex modeller. Subdivide the object to give it more vertecies. This'll give RDS a bit more to work from. Unfortunately, if you don't have a lot of RAM, you run the risk of locking up because you overtax your machine. I have had better luck with booleans on vertex objects, though. Hope this helps.