I noticed that they are super easy to snap together after having done one. first was a bugger, then rest were easy and i use bottom fist to pound which really puts it together good.
I bought a 5 pack of clear acid free backing boards for like $12 shipped. Good for those wrap around art covers or books that had commission sketches on them. Which i had 2 of. Now can see the back art. Tell'ya what .... some old chap is gonna' be thanking my dead ass for taking care of this collection when it gets sold off for pennies by one of my future grand kids estate sale.