Since God created the heavens and the earth by simply speaking them into existence, it stands to reason that Jesus can prepare our dwelling place by doing the same thing. So I doubt if He's somewhere driving nails and sawing wood.
Let's have some fun and speculate. The Scripture says there'll be a new heaven and a new earth. And the dwelling place of God is with men. And Rev 22 says there'll be a throne there, the tree of life, and water of life. And in Rev 21 John describes the New Jerusalem coming down out of heaven. Is the New Jerusalem what Jesus is preparing to bring to the earth for our eternal dwelling place?
This breaks down somewhat when John's angel guide said, Come and I'll show you the bride, the wife of the Lamb (22:9) Then he shows John the New Jerusalem. (22:10) Is the New Jerusalem the bride, or when John saw the New Jerusalem did he see all the people dwelling there?
Or is all this symbolic of something and we just don't know what it is? Ain't this fun?
Tom B.