What type of wood is everyone been using to make their coops from scratch? I'm going with 2 x 4s and probably 2 x 2s but was wondering if people are just buying regular 8 foot 2 x 4s, treated ones, or painting and priming them? College student so on a budget, but not sure if I need to prime wood since it's untreated? Dad says its ok not to get treated wood since it's not like I'm building a home. What about plywood? Thoughts?