Abstract: I will describe implementing the TTbar-formalism to construct the entire de Sitter space bounded by two timelike boundaries. In previous works a finite Hamiltonian quantum mechanics system was developed for a bulk with a single timelike boundary. The holographic dual theory contains bands of energy levels that correspond to bounded patches of semiclassical gravity with positive cosmological constant and matter. To realize larger patches (in particular, the future wedge in de Sitter space) two copies of such Hamiltonian systems are taken and a thermofield double state is constructed, in analogy with the two-sided AdS black hole state. I will also discuss causal wedge reconstruction via the HKLL procedure, highlighting that the tallness of de Sitter with matter is a feature.