Cinder blocks would work too. Add a plywood floor from underneath of the playhouse frame too, i would paint the plywood with some exterior deck paint so it’s protected from elements!
Honestly what you have is perfect. Angles you don’t really have to worry about for the playhouse you listed on walmart. I watched a video on the playhouse and it looks pretty easy to put together. From what the video showed, it looks like the windows all around the playhouse are rectangles...
I’m glad you figured it out! But if it was me i would definitely think about it more before you do it. I made that mistake with the first coop we built and how hard it was to clean out and not being able to walk into it. And we ended up building a new one not even a year later because of how...
Most of the experts on here will tell you the minimum is 5 sq ft for each bird in the coop, 10 sq ft each bird for run and 1 sq ft each bird for roost. Bigger is always better in my opinion.
Edit: you also have to think about the future. Are you maybe going to get new birds in the future? Does...