'Not-so-tiny' cultural centre

Reading up other articles under the tag 'tinyhouse', I have to draw the conclusion that my house is not so tiny after all.
Technically my house is 18m x 2,55m or almost 46m² !
I can imagine this is larger than many living-spaces rented out that don't belong in the category 'tiny-house'.
But, to my defense, I have two arguments:

1. Due to the construction of the bus and its original purpose, some space is lost as living space.
2. More than 50% of the remaining space will be used for a myriad of musical activities and other socio-cultural activities (some are already taking place)

So is 20 m² small enough to be a tiny house ?

I'm not there yet on the small ecological footprint, though, at the moment I'm heating my badly insulated living space with electricity generated through nuclear fission.
Soon I should switch to black-hole energy ;-)