Small greenhouse

I have run my small system all summer outdoors and certainly have enjoyed it. I want to be able to keep it going through the winter, but live in the northern NC mountains and Certainly will need to put my system under cover. I have a southern exposed brick wall near the door, with water and electric outlets. I am considering and enclosed 'lean-to' style cold frame. 5x8 feet.

I would appreciate any advice.

Thanks,