Here is what you can do with the 6.5 gallon primary:
Sanitize two 1 gallon jugs.
Mix your juice per instructions except for Skins, Yeast, and Oak.
Remove 2 gallons of the juice, and store in the fridge.
Add skins, oak, and yeast per instructions.
When fermentation has slowed (around day 4), add back 1/2 gallon per day.