I am making specifications to build a brooder that's 5' Wide, 5' deep, and 45" tall, including the legs. Wall will be 30" high. Floor and walls will be 7/16 OSB. Roof is slanted, hinged. i have a bill of materials/plan for a chicken house with dimensions 32"X30" and 45" high and trying to extrapolate from there. The latter chicken house is using 2X2s for legs and side support and 1/2" plywood for floor, sides and nesting boxes. i've been reading threads and viewing pictures of (coop) constructions and seeing a lot of 2X4s and 4X4s being used as posts and wall supports. again, i am going to make a brooder, a 5'X5'X2.5' (flat) box sitting on legs. it will contain chicks up to 3 weeks only, feeders, waterers and a lightweight 3'X3'X18" hover (made of 1/8" plywood and 2X2s). here's my question - do i need to upgrade the 2"X2"s to 2"X4"s or anything greater? i'm a woman, with no carpentry skills. this will be my second piece of construction, first was a compost bin made from discarded railings, put together and covered with hardware cloth. thanks in advance for your future comments.