Inside Out or Outside In?

The bus-painting saga has really bloomed. This all started with getting the paint on the nose near the washer nozzles a little better. Now, the front 1/3 of the interior is removed, the windscreen and half the windows are out and I'm trying to figure out how much farther this goes before it starts looking more done than undone. Today is a rough plan.

Start
I stood and looked at the bus last night, wrapping my head around how I should eat the elephant. I hadn't planned on painting any part of the inside when I started. But now, that seems like the right place to begin. Half of the windows are out, including the windshield, both fronts and one of the big rear ones. If I finish the front 1/3, I can use the partitions as the clean cut-off line with rust repair and paint.

playing around with colors

Option 1 - Inside Out
One option after getting the front 1/3 done is to complete the rest of the interior. I'll have the right paint color, and any over-spray or tape failures would appear on the inside (outside paint second -> unintended over-spray lands on finished interior color) rather than the outside. So this option is do the whole interior then do the whole exterior as 2 major steps.
Upside(s): when the inside is done, it's done. Once I've started on the interior, I can do it all at once, so it might be faster overall.
Downside(s): the rear 2/3 of the bus is currently where I'm storing all of the body bits, so I'd need to find them a new home. That makes for a bigger mess before it gets smaller. In order to really do the rear 2/3, the other big window needs to come out, as does the rear window, so, again, the mess grows.

Option 2 - Outside In
Another option is to just do the front 1/3 and then switch to the exterior that I'd started with in the first place. I'd come back around to the rest of the interior later.
Upside(s): I get the exterior done sooner. The stuff that's stored in the rear 2/3 wouldn't be there after the exterior is done, so getting after the interior later would just require removing the seats and cabinet.
Downside(s): I may not get back to the rear 2/3 of the interior for a while, so it would look crappy in between. If I re-install the removed windows because of delays or wanting to actually drive the bus once, I would have to re-remove them to do the interior or there would be a section of not-freshened paint under the inner side of the seals.

Conclusions
Its funny how just writing things down make a choice all the more obvious. While I will need to clean up the garage a little bit to fit the stuff from the back, it totally makes more sense to just do the whole interior at once. I found a bunch of rust under the front seats, making this decision all the more powerful. The exterior of the bus doesn't have much rust, but the rust that't there needs attention. At least one of the spots is a hole that I'll need to also treat from the inside, so, again, it makes sense to do the inside entirely first. Of course, that makes this a great deal more work. Better get crackin'!

To keep track of things, I'm playing with "a dark shade of cyan-blue" similar to that which appeared on the squareback in 1972 for the lower 2/3 of the exterior and a flat light/medium grey for the interior. Pantone detail for the similar blue follows. The pantone detail for the Enzian or gentian blue that matches the squareback blue is here.

R,G,B=0, 48, 92
Hex=#00305c
decimal=12380
CMY=cyan: 100 (1), magenta: 81 (0.8118), yellow: 64 (0.6392)
CMYK= cyan: 100 (1), magenta: 48 (0.4783), yellow: 0 (0), key: 64 (0.6392)

As always, thanks for following along...