Owie Plays thanks for the comment. It was a fun project.

thanks. We hope to do it again soon

Patience and cold freeze on contact temperatures. Although slushy snow can work really well too on the milder days. Use a good spray bottle and get both surfaces really wet and pack in with snow constantly adding moisture as you go. Keep the pressure on. Each block on the top few rows took about 5 minutes to place and set. The horizontal ones at the top are more or less wedged in place since everything around it was solid at that point. We used a combination of melting the ice with a electric skillet and a reciprocating saw to cut the angles for the last few rows.