This is one of those crazy, fun projects. It is cheap and great way to reuse materials. But it is a big one, so you will need a big space, like a basement playroom, or do it outside. I question how well it will work outside - strong winds? spider webs?
Another of my concerns is that yuck-yuck, rot dairy smell from the old milk containers. I would practice getting the smell out of one first milk jug. Also, don't forget you can use water gallon jugs, as well as orange juice, distilled water, ice tea, etc.
It looks complex, but probably the hardest, time consuming part is collecting and washing the milk jugs. Actually making the igloo seems like it would be a fun rainy day or weekend project. Usually I read directions about neat ideas like this one, and they seem way too complex or expensive (not to mention, leaving out a lot of practical information), but this project does seem doable if you have the materials and space.
This would make for excellent memories. First I have to see how much work goes into de-funking a old milk jug. If I did it, I would make the big one, 428 jugs, but I am crazy like that. I would have a slide down to our playroom if I could put one in. By my calculations, we would need about 40 families to give us 10 milk jugs. I can see my husband shaking his head at me right now.
Here is the link:
Side note, sometimes we moms can be guilty of doing things like this instead of the things we are suppose to be doing, like laundry and discipling our kids. Build your milk jug igloo responsibly ;-)