I have been riding a MTB hybrid fitness/touring bike and am looking at getting a road bike. My concerns are that I am a big guy at 6'0" 230 pounds and ride many less than ideal roads including some gravel and broken pavement. I'm considering getting a cyclocross frame and fork and building a "road" bike around it. I'm not worried about super light weight and have no delusions of or aspirations to competitive road racing, but I want something that will perform similar to a mid-level road bike. My main focus is recreation/fitness and participating in non-competitive group and charity rides.
Is this a good idea? Any suggestions on the frame and/or build?