Hey Jedi Minstrel, thanks for the comment. Good question on the torso. I use one of two methods (I think I have seen these both described on this site before, but I hit on them on my own):
Method 1) I carefully separate the torso at the seam using a very sharp craft (X-acto) knife. I go slow and try not to use too much pressure. When I've cut through the torso I use a jewelers flat blade screwdriver to separate the torso just enough to pop in whatever part I need to (I usually heat the arms or legs so they are more malleable as well). Then I glue the part back together (usually I use Citadel glue) and a mini-clamp. I find this works well, if I'm willing to be patient. But it's a lot of work. Oh, and I don't usually break the whole torso apart, I cut as little as I can get away with.
Method 2) I don't bother cutting the torso apart if the arms or legs are the softer plastic and I can "boil and pop." In this case I will often dremmel the limbs I want to attach so that they will fit into the unaltered torso and then fill the body cavity with hot glue. Once the hot glue is in there are two options: 1. let the glue dry and dremmel it - but be careful the heat from the dremmel might soften the glue making it hard to work with, and hard to clean the dremmel; 2. before the glue sets, stick the limb in and wait a moment then start turning the limb so it has mobility after the glue is completely set. I've had moderate success with both strategies. The nice thing about the hot glue method is that if you goof up just reheat the glue and try again.
Hope that helps. Feel free to follow up with other questions.