I did this all with fence panels. The dimensions were determined by my 2x4's. I trimmed the pickets to size and overlapped them to give it a real siding look. Then I power washed it and let the kids have fun, we have not finished decorating but we will and I am sure it will change over time since their decoration of choice is chalk. I say a weekend because you need to inventory what lengths of wood you have to plan it out and the smaller cuts for the siding can be time consuming. This didn't cost me a thing I had screws left over from building a deck. I built each wall then screwed them together and attached siding making sure to only screw into the facing wall so I could disassemble if needed.
Estimated Time Investment
Weekend Project (10-20 Hours)
Recommended Skill Level
Beginner