@Keet
a Project Statistics plugin
is not a YAUP 
#levels with #rooms (areas), #walls length and square meters per level/room/project,
I've already done with RoomsInformations plugin.+ It calculate walls areas with and without holes.
For furniture I've used also the Calc (Excel) as Cristi did.
e.g. To know what amount of pipes (length/type) and connectors/type was needed to buy when I renovate my apartment.
Anyway could be useful to have something similar for furniture:
-the number of the same object per room/level and total amount (chairs, tables, beds ...).
Probably someone who's in need will do it.
I've finished my renovation and I don't intend to do it again (not in this life).
Wile I'm alive I'm available to help.
----------------------------------------
A computer program does what you tell it to do, not what you want it to do. Murphy's Law
When all else fails, read the instructions. Murphy's Law
If you don't like "AS IS", DIY. Dorin's law
