I am closing in an attic space for an upstairs bonus room and need some help with the 3 way wiring configuration. The fixtures I have are two ceiling fans (each with light fixtures) and one additional downstairs light fixture. I have one 3-gang switch box upstairs from which I'd like to control both fans by a single switch and both lights by another switch and the downstairs light by a third switch. I have a 2-gang switch box downstairs from which I'd like to control the downstairs light by one switch and the upstairs ceiling fan lights (not the fans themselves) by another switch. Here is my wiring configuration. I've got a 12-2 hot wire going into the 3-gang switch box (Box A). From box A, I have 12-3 going to the first ceiling fan (Fan A), 12-3 going to the downstairs 2-gang box (Box B) and 12-2 going to a smoke detector. From Fan A, I have 12-3 coming in from Box A and 12-3 going to Fan B. At the downstairs 2-gang switch box (Box B), I have 12-3 coming from Box A and 12-2 going to the downstairs light. Any help with the wiring configuration would be helpful. I have an electrical book I bought but does not give a wiring example for this configuration. I hope it is possible! Thanks in advance!

I want to setup a new circuit for a GFI plug outside. This will be used to plug in 2 water tank heaters that can each draw 1500watts when the temperature gets really cold. I have a 100 amp service that only has one available slot left. What is the best way to do this project? Thanks in advance, Scott