am not an expert but what i would do with those glass windows? put layers of blackout cloth or other thick fabrics of your choice para natural ang dating aside from you can enjoy the sun any time you want without hassle wag mo lang hanapin sa gabi hehe.
another option would be a sliding acoustic panel to cover those windows when needed na nasa likod lang ng console if not in use. nasa iyo na lang kung ano ang ok at madaling i setup at kung alin ang mas effective. if you choose the sliding panels, i suggest fully covered ang windows for few good reasons; hindi weird tingnan, hindi nakakasilaw at kakailanganin mo ang dilim sa ht.
same thing with car detailing, especially DIY, you work per panel. do the back of the speakers treatment first, observe malay mo matuwa ka na and if not then work on fixing the sides and so on... maganda kung may maimbitahan kang friends to comment.
maganda kung multi-purpose ang approach sa treatment. yun bang parang natural lang ang dating at di halatang mga acoustics pala yun. may mga nakikita kasi akong setup na for some nakaka amaze pero kung iisipin mo ang weird na ng room sa dami ng nakadikit sa walls.
just my 2% of their 2 cents and my sig.