As a design professional and a contractor myself, I have been involved with hundreds of projects. I assume this will be your first one. Think about it. Most experienced RV manufacturers have built thousands of MH's all of different sizes, types, and designs. They make mistakes (as you will) and their current designs reflect that. You don't have their experience, you get only one chance to get it right. Do you feel lucky? Because if/when you aren't, you will pay for it in time, money, aggravation, etc.
I don't mean to discourage you, just the opposite. Just make sure you are clear on what you are getting into before you commit. If you end up with a half finished project when your energy runs out, expect to be compensated as though it is a TOTAL LOSS. It's a lot more than cabinetry!
Good luck with what you decide.
Chum lee