Dungeon Room Sizes

While creating a dungeon today I noticed some very important information was missing, room sizes. As you put down your different pieces, currently there isn't a way to see what your dungeon looks like, so if you want rooms or hallways to join up, creating a circular kind of route, or you want to build large side-by-side, you don't know where you are building. To aid people building dungeons, it would be nice to know the size of the different areas. We know that thing like the hallways are 1x1 units and others are obvious. But things like the rotunda or random encounter rooms or boss liche room or the stairs aren't quite as easy to guess at.

It would be nice to know what size these rooms are so that they can plotted with accuracy on graph paper.

Or even getter, at least for some of us with Unity, how about making these pieces, and maybe the whole dungeon set, available to everyone. And not just those who buy the Add-on store dungeons.