Islamic marriage

Further clarification

I am asking this question on behalf of a friend who is Muslim.Background:My friend who is Musllm has married a man who is Muslim and 10 years older than her. He makes 2-3x her income. In principle for the man to agree to marry her he devised an agreement which they both agreed to prior to the marriage where they would both commit money to the house, clothing food and shelter. He also explained that he may retire earlier and therefore she would keep working until she is the same age so that they could afford the house they are living in and be close to her family. The live in the USA. The husband also works part time out of the year because he cannot find stable employment for more than 6 months to 1 year at a time and has been constantly moving his whole life. This was known before the marriage and was explained by the man to my friend to see if she would agree. My friend was also married before and he was never married previously. His knowledge of Islam is not as great as my friend who was married previously to a man in a similar profession as her current husband but he did not have to keep looking for a new job every 6 months to 1 year but he divorced her at a young age. My friend wanted to get married again to regain her family honor. Her family did not like the agreement but did not pose any argument either nor were they privy to all the details because she did not disclose them and they did choose the first husband for her against her wishes when she was a virgin. The couple have also signed a prenuptial indicating any money the man and woman had prior to marriage was to be kept separate property and any prior debts separate. Furthermore, they signed a postnuptial agreement splitting all the married assets 50:50 with no alimony in the event of divorceMy questions are1) Is this allowed in Islam? He made clear his conditions to initiate courtship and marriage under these circumstances and she agreed in principle and in writing an agreement of understanding which they both agree to sign. How does this hold up Islamically? Any extra work my friend does he has stated she can keep that extra money outside of her main job for herself to spend as she pleases? All the other money collectively goes to the family and any kids they have. She was not forced to marry him and her the father made it clear he was not in agreement with him moving around and being away from home 2) He can provide food, shelter and clothing for his wife but she would have significantly reduce her quality of life which she does not want to do unless she contributes to the family?3) If her husband is not allowing her to keep money for herself specifically and he passes away is he obligated islamically to provide for her in his death. My friend has extra time to take a second job as her job allows her more than 3-4 months off per year. 4) If the agreements are not halal meaning they are not allowed in Islam can either the man or woman seek a divorce based upon the nonhalal origins of this agreement. Both came to this agreement willingly after mutual discussion. What recourse does my friend have if she wants to keep all of her money to herself? What recourse does her husband have?5) In a marriage like this with possibly some haram elements should the marriage be annulled? My friend and her spouse who get along when the agreement is in place are kept together by the agreement. They argue less and fight less. I was curious how much of this agreement is haram and what an islamic take on this agreement would be.