North Model Railroad Supplies <nmrs@...>
The added benefit I have found with Canopy Glue is that it dries flexible and provides a flexible membrane between the styrene and etched metal.
This helps to deal with the different expansion/contraction rates of the two materials when temperature changes occur.
This is certainly an improvement over the super glue used by the manufacturers, which lacks both the flexibility and sheer strength to deal the different expansion rates.
Your method sounds like it would provide a much stronger bond.