So I am replacing my 25" monitor that is on it's way out with this 21" VGA Trinitron I got today for $20 off Craigslist.

Here is what I am working with on the cabinet:

What would be the best course of action to get this big boy (70 pounds) into the cabinet?
I was thinking plywood with L brackets supporting it on the bottom and a piece of plywood spray pained black as the frame as it is replacing a monitor that is 25".
For reference here is the front:
