As you are no doubt aware professional CAD software can cost a fortune. I came from an AutoCad background using it for many years in the mining industry. I tried the software (in the link below) when I was in my "Linux Phase" and found that it worked quite well, especially considering that it is FREE. I have not tried this on my Mac, but I would suggest that you give it a try. All CAD packages have their own quirks and you really need to get familiar with the package before deciding that it is not for you. I could make this package work for me, but as I said, I came from a CAD background.
about AutoCAD maybe being overkill. But long time ago I stumble upon at least 3 kitchen or cabinet software for Mac. But is a pity I dont remember them o have a record. Try Google with "cabinet design software" or "kitchen design software". These software had templates and more design aides.....
Another free bee for you, which I have just started using on my OSX side - I use Autocad on Bootcamp mainly - is Draftsight by Dassult Systems. They are the plane manufacturer who I think own Solid works as well
Obviously pick up the mac download. Like I said I am just starting with it, but it does the trick and is very similar to Autocad.
Lastly and this may be a bit out the box, but have you looked at Google Sketch Up free 3d drafter. A much easier 3D package to use than the traditional CAD packages in 3D. Some great tutorials as well on You Tube.