If cabinet doors are such a game stopper for you, have you never purchased an item, and upgraded it over time? I am also certain that it would be easy enough to ask for some customization sprinkled in throughout the build. As for offroading, you could also probably ask if you could upgrade. No battery? You will be charged for a battery anyways, go buy one that you like. Bland looking? You do get to choose your own interior colors, plus, who wants to be flashy?
These folks are offering a bare boned sleeping unit that has a wee kitchen unit, for what I am seeing as a reasonable price.
I am sure I could build one myself, but how boring would it be for you folks to bash a free blueprint?