Re: Carcass sources.
Check and see if you have a Rockler or Woodcraft store, a woodworking club, or a lumber supplier(not a big box store) near you they should be able to give you some leads to cabinet makers in your area. You might also want to check Angie's list. You don't say where you are located so I can't make any recommendations further than that. Just about any competent woodworker should be able to accomplish what you want.
Be sure you live your life, because you are a long time dead.-Scottish Proverb