Oh dear. First of all you will have probably have to pay 15% of your net salary for your child. This is statutory and the Court has no jurisdiction in the matter. Go to the CSA website where you will find a calculator from which you should be able to work it out fairly accurately.
As regards the house - well, the Court's first consideration is the welfare of the child. This is a statutory requirement and the Courts have to comply with it. So the child needs a secure home. In practice that means that whoever is looking after the child ( the parent with care or PWC ) will normally get the right to live there while the child is still dependent, after which the house is sold and the proceeds divided ( this is known in the trade as a Mesher order, after the case where this form of order was first used ). However, in your case the house seems sufficiently large for it to be practical for the house to be sold, and for the sale to yield sufficient to buy your x2b a suitable house for your wife and child, and leave something over for you. But I do not know anything about it, so I can't judge.
I do not think your wife will do any better than a Mesher order, I feel pretty certain about that. What you need to bear in mind is that a Court has to consider your need for accommodation too. You must always be allowed enough to cover your housing costs.
Then we have the issue of maintenance. You sound like a high earner, if you can afford a house like that. Your wife is not correct in seeking to maintain herself in the style to which she has become accustomed. Except for the super rich, divorce inevitably involves a reduction in lifestyle. The reduction should be evenly shared between the parties.
I suspect your wife will get something in spousal maintenance, but not as much as two thirds ! Like all of us, she has to keep her ' needs ' within the limits of the resources available to both parties.
You say you are going before a judge, probably for a First Appointment. The judge will review the information (s)he has, and will probably give directions, which will include an independent valuation of the
marital home. If that happens, your wife cannot refuse.
Can your wife work ? The Courts might not expect her to work if you have a child of primary school age, but after that, part time work might be a possibility,
Your wife's claims seem to me well over the top, but she will probably get something out of this ; but without knowing much more, sir, I wouldn't like to hazard a guess at what that might be.