Would this be ok dry stacked or should I fix it before I get any further?

This is 5'x5' interior dry stacked right now. Should I get some mortar before I get any further?

Planning on leaving the front dry stacked so I can open it when needed so the 2 that are half out on the front wall would be stationary but the next layer and the 3 that aren't in place would be dry stacked to be removable.