それで雪を踏み固めてブロックを作り、それを積むような方法が適しているんですね。

、。

So you pack the snow down to make blocks, and then stack them — that kind of method works best, right?

Literal

So snow [object-を] stamp-firm [and-て] blocks [object-を] make, that [object-を] stack [like-ような] method [subject-が] suitable [explanatory-んですね].

踏み固める is a compound verb: 踏む 'to step on' + 固める 'to harden' = 'to pack down by stepping on it.' 適している 'is suitable/appropriate' uses ~ている for a resulting state. んですね at the end seeks confirmation while showing the speaker is processing new information.