I have a Protech garage/shelter. This is a very tough stable temporary shelter/gazebo type thing. Not sure of exact size but it is easily big enough to get a small car in and have space to work on it. I think you could comfortable work round 3 possibly 4 bikes in it. 
I had this in my garden and it stood up I the storms and floods of a year ago without the slightest sign of moving. The only down side if a falling branch ripped the cover however all parts are available as spares. Protech 
This is too big for normal race use but would ok for the TT or Manx where it will stay up for a while. Two people can put this up very easily and quite quickly. 
If anyone is interested message me and I'll answer any question as quickly as possible.