Abstract: A construction kit for toy building structures includes a plurality of basic planar logs having a slightly rounded edge on the lower face and male couplings on the lateral ends thereof. A plurality of alternative planar logs with a brick like patterned surface and male couplings on the lateral ends thereof are interchangeable with the above mentioned logs. The logs may be interconnected with angular connecting blocks having female receiving slots on four adjacent sides with a recessed area and a raised neck on opposing ends to accommodate adjoining blocks. The plurality of planar logs may be interconnected with architectural fixtures having receiving slots on the lateral edges. Recessed areas at angular points of the singular roof unit interconnects with the raised neck of the connecting blocks to form the skeletal structure. Raised receiving slots on opposing sides of the angular roof top and indentions along the roof line accommodate roof fixtures.