How do I work on the builder stage with my keyboard for accessibility?

To navigate the stage:

• Select the stage

• Press ArrowUp or ArrowDown to select rows

• Press Enter to enter a row and choose its modules

• Once a row is selected, press ArrowUp or ArrowDown to select modules

• Press Esc to clear the selection

• Press Esc to focus on the Row or Content

To drag and drop elements:

• With a row or a module selected, press TAB to focus the handle
• CMD+D / CTRL+D to trigger the drag
• ARROW UP / ARROW DOWN to navigate through drop targets
• Choose the drop position. Press t to select the top border, or b to select the bottom border. 
• ENTER to drop

Demonstration: