Acoustic treatment for side glass doors / please, need ideas.

Ummmm...blackout drapes. You can even buy the material and have them custom made. You can work out a suitable method for temporarily hanging them and removing them like velcro, etc. I'm sure we're similar in that my wife controls the decor (she has great taste), with my final cut, except for the A/V wall and my office/listening room where I have all my mounted heads (just kidding). If she can find a heavy enough material she likes she might let you install them permanently. Or you can impress upon her you haven't asked for much in the remodel so she could make this concession. Good luck. Having owned a Custom High End install/dealer business (just for info, not bragging-if you can get someone to pay you for something and is happy about it...) I have used drapes like these and some I have on a drop down roller used for movie screens that is also triggered by the HT remote to auto drop for movie time. Lots of good options, but heavy drapes are great. A little more A/V dampening never hurt anybody.

Sloryder, thanks that's a good idea, I'm sure my wife and I can get an agreement on that. 

Blackout drapes are good ideas.  Used them myself. Work really well.

I also want to suggest, that while imperfect, treating what you can can make up for what you can't. For instance, extra thick rugs, ceiling treatment, and diffusors between the speakers may not fix the glass, but they can make things so much better.

Best,

E

Thanks Erik, I think I have a good idea about what to do with side walls.
Back wall will be fully covered with a LPs rack, right to letf floor to ceiling. About front wall,  any experiences with bass tube traps in the corners?

Bass traps are great, also suggest considering diffusion, especially behind and between the speakers.

Contact GIK acoustics for pro level help, and very cost effective products.

Best,

E