mesurements can be dificult

so after changing the mesurments a whole bunch of times,i realised i have no clue how to estimate. first.things where way too short,then things where too far apart- so now i want ti do it properly and figure out how to build this fram to exact right size.
i decided to make a small moddle before going straight to the big full sized frame,so as to get the mesurments right. while I as measuring I also noticed that while I had my carpet layed out a lot of people would not walk over  while it was layed out, as if they where trating it like a work I was creating.

I have also been looking at joseph beuys felt room and wolfgang laibs wax room.

http://annagravelle.files.wordpress.com/2010/01/picture723.jpg

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4jK8Fyuz-WrDMhwPxaEmaMcV5hQ3QsIzVN-q1JU6_WZxQgH7c75La90WgQi6uxPrWyq2sbOPIjI6laQLrK9xwqRfcOVAgp4l90_JEMqLlxS66IQmxYaI5LcaSIiGan6racZ9k8Dt_cHA/s1600/c0035864_133930.jpg

http://www.washingtonpost.com/rf/image_404h/2010-2019/WashingtonPost/2012/07/17/Style/Images/WolfgangLaib_InstallingWaxRoom.jpg

http://www.alenasarakapud.com/sites/all/themes/alena/css/images/laib/wl-1.jpg