Why not make another suggestion? <object class="emojione" data="https://resources.enjin.com/1489581540/themes/core/images/emojione/svg/1f61b.svg?0" type="image/svg+xml" standby=":p">:p</object>

So this one consists on letting the /fly on you terrain. This to make the building easier and when you have a ultra mansion could fly to another room.

Once again, Cya:

-JustOneLegend-

You didnt have to be that rude u.u

If you really want to build something that easily, you can always go to the creative server. If you want to at least glide in a big mansion like you said, you can use an elytra.

Or you can just use dirt as scaffolding while building.