Building a sound room in the Musjid and decorating the Musjid

Q:

1. A Musjid is being constructed at the moment. The building is not yet complete and the Musjid boundaries have not yet been specified. Will it be possible to have the room beneath the staircase as non-Musjid area while the staircase leading to the first floor is Musjid? The benefit is that Azaan can be given from this room and the sound system will إن شاء الله be safe in that room. Please advise.

2. Can the qiblah wall in the Musjid be decorated? If it is not permissible, what will be regarded as decoration? Will Qur'an aayaat, ahaadeeth or duas be a form of decor? Will marble or tiles be considered a form of decor?

3. Can public funds be used for aesthetics of the Musjid? Will a dome be considered as aesthetics?

Getting married to please one's uncle

Q: My husbands uncle asked him to marry his cousin. She lives in Kenya and we live in the US. I am okay with it but my husband is telling me that he feels like he is deceiving her because he doesnt think he can take the responsibility but he doesnt want to get his uncle mad and he regrets accepting it. What I want to know is, is it wrong for me to make dua saying "Allah, if he cant take the responsibility, may Allah not make the marriage happen" because I dont want the girl in sadness because she is my sister? I dont want her to miss the chance of having someone that will love her and not be forced because the father wanted?

Knowledge of the unseen

Q: I am asking this question on behalf of a friend. He wants to know if there is any dua that can be read to find out if his wife is having an affair with her sisters husband. How can one see if they are still having sexual intercourse whenever she goes for holiday to her sisters house?

Doubts on hurmat-e-musaaharah

Q: I usually get thoughts on hurmate mushahara, like when I shake my dads hand, I am scared and worried. I don't have lust but I get thoughts that suppose it is lust. My father in law is old, about 60 something and Aalim. Now he was lying down in the room and I was in the other room. It was open so I could see who was sleeping. Now I get these thoughts about lust. So my father in law was sleeping and I went to pray namaz. I was just looking at his private parts, it was not open, he had on kafni n izhaar so I couldnt see his private part and the room was kinda dark and I was a distance away. Now I didn't have any desire but I just get these thoughts about lust. I was just looking at the private part area but father in law had on his pants. So after I saw something like a penis, I was thinking that his private part was out when he was sleeping or was it a material. I saw not sure but my heart was thinking that it was not his penis showing. I just get these thoughts and I don't want them. I have no lust feeling for my father in law and I didn't look with lust. I just looked because I wanted to see if I get these thoughts. Is my nikaah valid or will hurmate mushahara apply?