Child’s Wagon and/or Toy Barn

Hello everyone. I was wondering if anyone has ever made a child’s wagon and if you followed a woodworking plan or just built it “on the fly”?

I have a precious 8 month old grandson and I’d love to make him a wagon for Christmas.

I was also wanting to make him a play barn that opens and latches shut to keep the animals inside. I know the animals only come in like 2 scales but I haven’t decided how big I want to make it.

His birthday is in February so I have more time to work on the barn.

Also, has lumber prices skyrocketed everywhere else like it has here? It’s crazy!