Abstract: A wall structure comprising a multiplicity of elongated wall panel forming members and elongated wall periphery forming members. The wall panel forming members are constructed to extend in horizontal courses with alternate courses being formed of siding elements and bar elements. Each siding element includes panel defining opposed faces simulating logs, opposed side portions having elongated grooves therein and opposed end portions having recesses therein forming lap sections. Each bar element includes opposed panel defining faces simulating mortar, opposed side portions having elongated tongues thereon of a size to engage within the elongated grooves in the side portions of the siding elements and opposed end portions having recesses therein forming lap sections similar to the lap sections in the end portions of the siding elements. The elongated periphery forming members include elongated corner, base plate, and top plate elements.