Church Architecture and Iconography
During these same days, God gave Moses commandments concerning the building of the tabernacle: of what it should be made, and how; and the vessels they should make for the sanctuary, and the commandments concerning the holy oil, the incense, and the priestly sacrifice. By saying to him: "You shall make everything according to the model of the tabernacle that I will show you," he first called it a model and a temporal tabernacle, to indicate that it was transitory and that it would be replaced by the church, the perfect prototype which lasts forever, and so that they would esteem it because of the likeness to the heavenly tabernacle. St. Ephrem the Syrian, Commentary on Exodus.
Links From Orthodox Sources
The Church Building and Its Arrangement - Archpriest Seraphim Slobodoskoy
Some Principles of Orthodox Church Architecture - Aidan Hart
Art and Architecture - Greek Orthodox Archdiocese of America
What Orthodox Iconography Is - Photios Kontoglu