I'm not sure of the exact question being asked here. Are you asking if the proposed setup is fair? Or how to split equity in the partnership? Or something else?
If you're asking if it's fair, it sounds fair to me. But what really matters is do you both think it's fair? If so, I say go for it.
As far as splitting equity when partners are contributing unequal amounts, I'd say it's pretty simple: Each partner owns a percentage of the equity based on the amount they have contributed, divided by the total contributions made by all partners. Of course, certain partners might get more equity based on work done or other considerations.
When I owned property with partners and we had ongoing mortgage payments and other expenses, I just tracked ALL contributions over time. Every penny that went into the property/business was recorded (as it should be anyhow for tax and other purposes), and credited to the partner who made the contribution. In our case we kept it simple -- I kept a business account with enough money to maintain the property and assessed quarterly, equal contributions to all the partners as needed to maintain enough money in the account or to cover any larger expenses. Partners who made larger up-front contributions towards the down payment had more equity in the partnership, and I got a larger percentage as the managing partner (since I was doing all the work to run the business).
Once proceeds from a sale or any other distributions are made, it's a simple matter of figuring out each person's percentage of the equity and doling out the proceeds based on that percentage.
So say over time that you and your husband put $500,000 in total into the property/business (I picked a round number to make it simple, obviously that won't be the case in real life). All your contributions are recorded in a spreadsheet (as they should be anyhow, see above) for both of you, so it's a simple matter of adding up the totals for each of you. You determine that of the $500,000 total, $304,758 was from your husband and $195,242 was from you.
It doesn't matter what the contributions were for -- whether it was for mortgage payments, insurance, buying cleaning supplies or hiring a maid. All that matters is the bottom line. In this scenario your husband owns 304758/500000th (60.95%) of the equity, and you own 195242/500000th (39.05%) of the equity.
Hope I haven't missed the boat on your question, and good luck!