Pretty much what I'm planning on doing, except with some solar power and a cellular modem.Wow.....You take me back to my early 20's....when I jumped in a makeshift RV econoline van (with my girlfriend...now wife...and Maggi our black lab) touring the country and going thru mexico for 3 months etc.
Unfortuneately, I will not be a wealth of information to you in regard to making an econoline into a "COMFORTABLE" RV
But it sounds like a great project....about all we did was carpeting and a raised bed in back where we could stash stoves and clothes and dogfood underneath.
Good going