I am interested in aquaponcs, but am not likely to try doing it at this point in life.
Some random thoughts for your consideration:
There are 275 gallon containers on the used market for cheap or free that might be put to use. Watch CL or check your local sources for them. Make sure they have been used for food related products and not dangerous chemicals.
http://www.containerexchanger.com/subcategory/IBC_Totes/12
Way back in the 80's I saw a set up that I thought was a great idea. A wood frame, plastic covered lean to on the south side of a house. Inside it they had built a large concrete tank that was divided into sections. It held water with fish. The water was circulated through a base board heat system in the house to help with warming the house. There was variety of vegetable and flower plants growing within the "greenhouse". They used a variety of passive solar absorbing things to help maintain heat. May be some ideas that would help to cut costs of maintaining the temperatures in the winter at least.

There are 275 gallon containers on the used market for cheap or free that might be put to use. Watch CL or check your local sources for them. Make sure they have been used for food related products and not dangerous chemicals.
http://www.containerexchanger.com/subcategory/IBC_Totes/12
Way back in the 80's I saw a set up that I thought was a great idea. A wood frame, plastic covered lean to on the south side of a house. Inside it they had built a large concrete tank that was divided into sections. It held water with fish. The water was circulated through a base board heat system in the house to help with warming the house. There was variety of vegetable and flower plants growing within the "greenhouse". They used a variety of passive solar absorbing things to help maintain heat. May be some ideas that would help to cut costs of maintaining the temperatures in the winter at least.