Step 4: Roof
It was more of a four-sided "tube" than anything. No floor was no problem, as the roof of the lower box becomes the floor of the upper one, but NO ROOF?
I considered for a minute what I should do. I have some other salvaged materials around that I use for projects. I'm sure I would have had something else there I could have used. If the box had a top, it would have been moot as well. If I had extra cardboard, I could have built a roof from that as well.
But why do any of that when I already had EXACTLY the right thing for a roof!?
I've started doing a little gardening lately. And while I'm no master gardener, it still feels good to grow a little tiny bit of my own food. Towards that goal, I've been collecting materials to build cold-frames from. That includes a clear cover from a basement emergency exit.
My father is a remodeler, and somethings finds odd items getting thrown out from a remodel, or even great scrap material left over from new construction. In this case, there are sometimes fire-codes that require extra exits from basements. One style is sort of an extra-deep window well with a ladder. Over the top is a clear cover, roughly 4' square. My father gave me a discarded one to use for gardening season-extension.
By chance, it's EXACTLY the right size for the box. I simply set it on top, and the box fit exactly inside the lip on the clear plastic cover!
Instead of just having a dark upstairs box, or one with a pitched cardboard roof, the clubhouse has a fully formed and functional skylight!