Woodworking

To preface this, I have no idea what I'm doing. This is basically my first woodworking project.

I'm making a standing, wooden door stop (as opposed to a wedge style). But I'm not sure it'll be heavy enough without some addition.

Currently, I'm glueing 3 (or 4) layers of solid 1x8 Aspen wood board together, then cutting the shape out with a band saw. Then sanding, painting, and sealing them.

Thoughts on how to, simply, add weight?

One thought I had was to have the middle layer as just the outline of the shape with the bottom cut out, so the resulting piece is kind of hollow. Then filling that space with plaster of paris.