I don't remember reading one, but I do remember something posted by SirPleib that said something like "In general sooner is better than where, so build the FP in a city near the capital in the direction you expect to expand the most as soon as it becomes available. Try to select a city with high shield production. Also with the increased power of armies, it is usually better to brick by brick build the FP and use MGL's for Armies"