I like to teach Exodus 25-31 by first starting out talking about why the Lord wanted them to have a tabernacle in the first place, and then liken this to our day to show why the Lord has us build temples today. Exodus 29:42-45 and D&C 97:15-17 are excellent verses explaining why the Lord had the ancients and his saints today build temples.
I like to show students how much temples are emphasized today. The following infographic is useful:
