Hi. I'm wondering why you'd need a vestibule if you are also getting two bases and the tarp! If I remember correctly, the two bases joined together are at least as big as a base and vestibule. But I'm willing to be corrected!
I have the two base and tarp set-up, which allows for plenty of options. Re the stove jacks, I have on in one of the bases, and one in the centre of the tarp. I also have a nest which I also use in my 8-man tipi, and that works really well in the LBO. Great for keeping the bugs out.