Thing is you can't just assume that the way things have been was working. Clearly it wasn't or they wouldn't be separating. Many Dads find that on separation they would actually have liked and want more time with tehir children. But society expects them to be the breadwinner and mum to be the carer.
It's only when you step outside that 'normal' situation that you realise that actually this isn't what I want.
So you can't simply say that things should continue exactly as they were before.
On the other hand dad can't expect to get exactly what he wants now either.
OP has already said money is an issue in this relationship split. So I would hazzard a guess that he is probably thinking equal parenting time means he won't have to pay maintenance (which he still would btw) and he'll get help with housing costs and child care costs etc (he may but not because he has a child as he won't have the child benefit)
The money issues in this relationship will not be solved by an alternative week situation. In fact both parents will struggle to hold down a job (as I mentioned above) and it is likely they will both have to be SAHP in order to maintain it, or dad will have to use childcare.
So dad needs to consider if that suggestion is in his dc's best interests. As I pointed out above it does not seem to be to be in the child's best interest to go to childcare when a parent is willing and able to care for them instead.
OP this is all very new for you and a very confusing time I'm sure. It is hard enough dealing with the end of a relationship, but then to also potentially have your whole world turned upside down in terms of caring for you child, finding a job etc is a lot to handle.
Please be kind to yourself and don't rush into any decisions yet.
Try and find out from your ex is he understands the implications of his proposal. Ask him how he would juggle work and childcare (my bet is he's expecting you to have dd during the day and he will have her overnight OR to use some kind of childcare)
Ask him how he plans to pay for that childcare along with housing and maintenance.
Ask him how he thinks your dd will react and feel to being away from her mum for a week at a time and that you appreciate he wants to see her regularly, just as you do, and that whatever arrangement is decided should have your dd's best interests at heart, not his and not yours.
Please do work through this website which may help you see that there are alternatives to his simply seeing your dd on alterate weekends. You need to find a solution that works for you all so you should consider alternatives and be prepared to swap and change them if they don't work and as your dd gets older
home.clara.net/spig/p-plans/spa-ttc.htm
Also get this book for yourself and for him. It may help you both with putting your dd's interests first.
www.fnf.org.uk/shop/product/categoryid/21/productid/81
Remember your ex loves your dd just as you do. Just because he hasn't been a handson dad up til now doesn't mean he can't learn to be (as you did) given the chance.
And please don't assume that because he was the one working before that he is happy for that to continue or that it should remain the case or that only mum's can care for their children successfully.
Your dd will benefit enormously from two parents who are both important parts of her life, even if they are not together any more.
Hard as it is you need to try and work together to find the best solution. Not easy with so much hurt and upset between you both. Perhaps you could suggest some mediation to him as a way forward to explore the options here if you find it hard to speak with each other about it all right now.
Big hugs to you, I know these decisions aren't easy.