Just speaking from my own experience, not a legal perspective:
Ex and I split up when DD was just a year old, and we decided from the start that it would be 50/50 (I felt guilty as I was the one splitting up with him, and didn’t feel right to deprive him of being able to have equal time with DD, plus there’s no way I’d have been able to work full time if I had DD sole custody).
As I was still on mat leave, I had to find a fulltime job sharpish.
We were in a fortunate position that we had two properties, so he stayed in one, and we sold the other so that I could buy a flat.
Tbh, I wouldn’t have thought that your ex would need to pay you maintenance if you’re doing 50/50 and earning similar - why would he? At the time of our split, I found a job earning around £33k, whilst he was on more like £100k, but there was no question of maintenance at all, and I wouldn’t have wanted it, as it would have made me ‘beholden’ to him, and given him power.
If you’re considering 50/50, do think about it carefully. It may seem the ‘fairest’ division, but in reality can be tricky. As our DD was only one, we thought that there’d never be a problem as it’s all she’s ever known.
However, 8 years later, she’d much prefer to live just with me, and doesn’t like having two houses. She began saying this when she was 6, with much distress and angst all round, to the point that she was crying constantly, and became depressed.
EXDH refused to believe her/me, and refused to change the 50/50. This went on for 6 months, and he only agreed to make a slight change (to 60/40) when I threatened to take him to court.
Sorry OP, I know this probably isn’t the kind of thing you want to hear, but just trying to give my view. Good luck with everything. Feel free to PM me if you have any questions.