cyber_ballz,
Thanks for the more detailed, un-encrypted description! :) It definitely helped understand what you're trying to do and why. Although with the help of some selective internet searching, I believe I eventually figured out your first post! ;) LOL
Sorry for the loss of your dad. Believe me, I know how the loss of a loved one can cause us to refocus our lives. Although in a way completely differently from yours, a serious family medical situation brought us into RV'ing as well back in 2004, and I STILL think it's one of the best decisions I've made in my life. (Not that there are a LOT of them to choose from! LOL) At the time I did it, though, most of my friends and family said we were crazy. But after losing our 12 year old daughter to cancer 4 years later, they ALL saw the "genius" in our decisions. So, I understand about wanting to do this for & with your kids.)
That said, building a floorplan from scratch IS a lot of work (plumbing, 12V electric, 120V/240V electric, heating/AC, insulation, appliances, etc.) but it definitely sounds like you've got the resources & know-how to do it. The only impediment I see for you is "time". Kids grow quickly, so you have to weigh that into the equation as well. I'm wondering if you have considered picking up a gently used 25 year old Prevost bus conversion (or other high-end rig) and get started with the RV'ing right away. There are quite a few available, if you look hard enough. Yes, the initial $$$$ are greater, but it will afford you the additional time to make even more memories with your children.
Anyway, Good Luck and I'll be interested to see which direction you end up the fruits of your labor! :)
~Rick