Also take a look at Fright Props. They have a lot of prop controllers and components that you could use together to bring a figure to life. Monsterguts and Spiderhillprop works also have motors and mechanisms to animate props.
Home Depot has a clear non gloss polyurethane that you can coat the brick panels with a paint brush or roller. I used this for my crypt wall last year and it seemed to work OK. However I did not leave it up in heavy rain. You could buy a quart and test it on a piece of scrap.
Ditch the L bracket and take an additional length of pipe, heat and pinch one end and drill a hole in it. Mount the mini spotlight to the pipe. On the opposite end of the pipe, cut a 45 degree angle so that it can be used like a stake.