Well if misery likes company welcome aboard!! It is easy to think it will only cost X, but when its all over it costs X times 3!! Most guys wouldn't want to admit they have as much in their projects as we do, for fear that people may think we're either nuts or lavish spenders and they could do it so much cheaper. They cant and we are not. You and I both had specific design criteria yours stealth mine a 9' garage door.
What's important is that folks come to this forum for info not BS, they need honest costs and realistic expectations, if they think they can take a worn out old Freightliner they bought for 6 grand at an auction and they dream of a 200K Showhauler, they are not going to build it with surplus parts foe just 10 grand, like you show above, it takes a 5th of that just in taxes and licensing.
Thanks for sharing your project, and its costs, now we want to hear of all the fantastic places in our wonderful country that you will be visiting.
Unless of course we now get to follow along with a trailer/garage/living room build to go behind the Stealth Camper!
I hope all goes well for you in that smaller space, it still seams tight to me but it is very, very well constructed and should hold up well for years.
-blizz