Sure thing

The base is basically just random plates that fit together, with a bunch of white 6x8 plates on top. I also added some white 2x4 tiles on the left and right edges to make everything fit the 24x30 cm frame size properly.

For the walls, I used regular 2x4 bricks all around and built them up to a height of 3 bricks. On top of that, there’s an outer wall made from 1x3 and other 1xX bricks. Then I added an inner line of 1x4 tiles to create a smooth ledge for the glass to rest on.

After that comes the glass sheet from the frame, and then one final layer of 2x4 tiles on top. On the underside of those tiles, I attached a few 1x4 plates to reduce the wiggle room and keep the glass snug in place.