On your description I noticed that your solar cells are placed to totally obscure the rear view of the driver. Why not place them on louvers instead? You know, something like what Deloreans had over their back windows in the past? Covering the rear window with a louvered set of horizontal "shelves" will shade the interior, allow the driver to see out the back with no difficulty, and allow a flatter surface and thus a more efficient and denser placement of the solar cells. I am uncertain of the aerodynamic cost of louvered rear hatches, but since the planes are in line with the air stream, I'm betting that the effect will be minimal or perhaps even beneficial!
If solar panels mounted on exterior louvers are problematic, interior louvers would also work and maintain the stock aerodynamics. I'm betting that allowing rearview mirror sight out of the rear window would outweigh a small aerodynamic drag (exterior) or loss of interior volume (interior).
A lot of non engineer, non production, and non costing people comments here. I support keep it simple and no engineering changes in the first production model. Let's trust the team who have done a stellar job with limited budget and staffing resources to get a version out the door that can generate revenue for the company. Then the analysis can take place on which enhancements most customers want vs. the time and resources to incorporate them and the amount of revenue they will generate. Remember this is a business that needs to sustain operations through revenue generation and profit. If you do not like the current design you do not have to get full solar and can wait for a third party or the next iteration of Aptera to incorporate some of these ideas based on a tradeoff of idea vs. cost. vs. effort vs. market appeal.