Haha.. that is one popular stove design! I, too, had one of those in my possession. It was green like Nat's. I also obtained it (and the slightly larger 4-burner one I have currently installed) for free from two camper trailer tear-downs. I gave it away to some off-the-grid friends of mine, but I think the piping was too rusty for them to bother putting it back into service...
Bus project looks good!