Welcome to the porch! It wraps all the way around the building, so lots of space 
As said, CE4+, CE5 heads are rebuildable, very similar to rebuilding Novas and even Kanger BCC. Just use longer wicks
Yes, fear of hardware failure is a driving force when leaving the house. I'll have at least two devices, both with fresh 18650s or freshly charged, and with full toppers of different flavors. One will by my SVD, often with a 5 ml Hypertank. The other may be my KMax or a 1300 Spinner with some other large capacity BCC. With somewhere north of 3000 mAh and 7 ml of flavor, I'm getting comfortable
I also have a couple of lightly padded Altoid type tins that can hold 3 or 4 extra toppers, that I'll sometimes take if I think it's going to be a really long excursion, and proper (noncondictive) boxes for extra batteries as well.
As said, CE4+, CE5 heads are rebuildable, very similar to rebuilding Novas and even Kanger BCC. Just use longer wicks
Yes, fear of hardware failure is a driving force when leaving the house. I'll have at least two devices, both with fresh 18650s or freshly charged, and with full toppers of different flavors. One will by my SVD, often with a 5 ml Hypertank. The other may be my KMax or a 1300 Spinner with some other large capacity BCC. With somewhere north of 3000 mAh and 7 ml of flavor, I'm getting comfortable
I also have a couple of lightly padded Altoid type tins that can hold 3 or 4 extra toppers, that I'll sometimes take if I think it's going to be a really long excursion, and proper (noncondictive) boxes for extra batteries as well.