I love this. I'm going to have to talk my husband into letting me build this one. I wanted one and since you made one that can be taken apart is a plus! I love the angel statue , I may make one of those too. I see you use the white styrofoam, have you tried using the blue or pink. Iv'e used the pink for a the "Beloved tombstone I'm building now. I haven't used the white, but I looked at it at Lowes, It's to sponge like for carving. Just a suggestion to help you out a little.
For tombstones you can't beat the pink styrofoam. It's fantastic and it's all I use. The dense pink and/or blue styrofoam is the only type you should use for smaller projects and things you will carve.
For the facade pieces, I thought I would try something new this year and work with the white styrofoam. It's not as dense, and it's not recommented for "carving" but it's a great alternative to sheets of plywood. It's really light, takes paint well, and can be cut with a knife, which reduces the time and mess one would encounter with plywood or MDF sheets.
The white styrofoam is fragile stuff, so you do need to be careful. I like how my props are turning out, but I am still nervous about the long-term survival of my white styrofoam structures.
This is a big experiment for me.