Removing inside walls
Looking at the 3D model, the wall to the right of the front entrance door is a load bearing wall. It carries the weight from the roof through the wall and then the weight is distributed to the pillars on both sides of the wall. The back inner wall though can safely be removed.

If you choose to remove the load bearing wall, it might not collapse right away (crossing fingers). But in addition to the weight (load) of the roof structure on the wall, there is also the wind load (and that could be catastrophic). Most people don't appreciate the high load wind places on a structure. 

Don't remove a load bearing wall without installing a way to transfer the load onto temporary supports. Contact a Structural Engineer if necessary.