The first thing that surprised me was that Billy wasn’t going to use bricks. Instead he had a piece of board that pivoted on some old ski poles and included a little tongue to hold it in place (more on that later).After finding a pretty flat spot* with snow firm enough to stand on, the method basically involved scooping up a decent-sized lump of firm-ish snow and packing it against the board, then moving the board across a bit and repeating the process.*Building your igloo into a slope can make the build easier, but don’t go too steep! @aidanmh This igloo was set to be three metres across, but first-timers might want to start with something smaller (which would also be warmer unless you have five people sleeping in it like us).Keep moving your board around the centre until you have a tiny round snow pen. Then start again, stacking in snow, pushing it together and filling any gaps before moving the board. Don’t rush! If you get bored, peg a snowball at your mate or challenge them to a snow wrestle to warm up. @aidanmh This is where the metal tongue comes in handy, it pokes through the board just below the centre and holds the board up while you pack snow with both hands.