I agree that canopy glue does it's job, but it is forever. So you can forget about getting back inside to add scale details, etc. As for the canopy cracking, well I guess it depends upon the canopy material, the installation, and the abuse it becomes subjected to.
My own experience has been quite good with screws, in sufficient number, and properly installed. I'm not opposing the use of the clear drying glue, but rather presenting another option.