My attempt at indicating the major contact points on Xcalibur. I honestly am at a complete loss to guess how this thing will perform, but I suspect more like Minoboros than Valkyrie. I don't feel confident that this will be a better choice all-around than Valkyrie, but hard to say when we add Xtreme into the picture.
Of course, hard to make a real judgement just from seeing the top view.