Good idea, Alph!
These are some pretty nice little crates and the price is brilliant. At £2 a crate, you could fill an industrial board pretty cheaply! Plus it would look pretty damn good.
I can see from the pictures that they stand up to a fair amount of evenly displaced pressure but could you poke your finger through or crush them in your hand? I assume so and it's not a bad thing, it's to be expected, i'm just trying to get a picture of how much wear and tear they'll take. I don't play at all really but when i start i don't know if the people i'm playing with will be as light handed as i.
I could see myself with a few of these for scatter terrain or to take to another location for gaming but i'm more inclined towards sturdy, high quality terrain that will last and take a lot of accidental punishment.
Anyway, those are my thoughts.