The Following chart will tell you how much weight you can expect from your wood selection. A simple comparison of the lb/ft3 of cedar and any other species will tell you what you can expect in added weight. In the following chart (chart 1) you will note that cedar weights 23 lbs/ft3. Adding cherry wood will double the weight of any section made from cherry at 43-56lbs/ft3.
Hardwoods are much more challenging to work with so keep in mind that not only will they add weight but will require extra work in milling, trimming and much more sanding and sandpaper.