Airborne2:
The V1 Motor shields allows me access to the A0 to A5 pins but they are Analog. The HC-SR04 requires (as far as I know) digital Outputs & Input and the lights, etc would require Digital pins. Somewhere I seem to remember that some of the Analog pins can be used as Digital pins but I can't find the article again.
Analogue pins are just digital pins, with the added functionality of analogue-in.
digitalRead(A0) or digitalWrite(A0) is ok. Or pin number 14-19 for A0-A5.
There are also "screw shields" that can go between the Uno and the shield.
So you can use all the pins that are not used by the motor shield.
Leo..