If the roof is to be changed its not worth doing much at all for now. Many times I have seen an install more or less destroyed by wayward materials, or a simple 'adjustment' by the roofer as it was 'in the way'.
Better to get plans in of the outlet location in each room, and an idea of the types of channels you want pumped round the house (there are plenty of interesting channels on other satellites, have you checked if these are useful ?)