I thought the combination of the shield and the initial caps of your name might show a "strong/family crest/protection" kind of vibe. Could be any colors. This is to show you the simple concept. Also size relationship between mark and type can be varied. I wanted you to see the mark clearly here.
This one is a simple gavel image making the "C" in the negative space. Not sure you need the "CAD" in the mark. Just a memorable, simple, easy to reproduce image. This again is conceptual an can be manipulated in color, shape, etc....