Great work Alex. That base is going to look grand when it's done. I know it's a bit late, but for future reference, one way of stopping, or at least minimizing, paint bleed, is to 'seal' the edges of the mask with the previous coloaur, thinnly enough not to cause a ridge. The, when you apply the 'new' colour, it can't bleed through. Also, if you are unable to do this, when you apply the 'new' colour, do it away from the edges of the tape with the first strokes; in other words, working inwards between the edges of the masks.