well ,i'm continuing to gather equipment and preparing to get the greenhouse set up in the spring. i bought a book called the solar greenhouse. for all the thinking we(I) do trying to prepare to get my system up and going ,there are always things to learn.the book says that there is a 12%+- heat gain in situating the greenhouse east west. i really don't know why my thinking was north south outside of the convenience of the location. so now i'm going to have to give this a lot of thought . i'm wondering if the investment of cutting into the bank,side of hill and bracing ,etc. will be a good long term investment. if it's going to help the plants grow on short winter days and keep the fish just a bit warmer i guess i'll have to figure it in. if there are any thoughts on this they will be appreciated ,cause i don't really want to dig in .i think i better take the tape measure out and get to measuring.