Once a query has been created the query itself (as SQL) can be saved to a file or a 'favorite'.
Your are right that the canvas and the grid of the query builder cannot be saved. Hoewer you can save a LAYOUT from the Schema Designer. We plan to make it possible for the QB to open a SD layout. This will be a few weeks only before we release.
'reverse engineering' a SELECT statement into a QB grid display is not planned however. This does not necessarily mean that we will never do .. only that currently assigned tasks does not include this.