Marc5 20ft x 30ft Log house Building Kit with bunk loft sleep area | Hud-1 EZ Buildings The Marc5 Log cabin kit is a multi room design with a lofted bunk area. The Marc5 is 20 ft. x 30 ft. down below and a 20 ft. x 10 ft. loft bunk area which gives this building 835 sq. ft. of space. The Marc5 offers a perlin roof system design that gives it the open vaulted cathedral style look. The building is shipped direct to you via curbside. Roofing shingles are sold separately.