Modular New construction Loan advice

[Kane Spangler]

So here's my situation. Currently Renting (Sold a fix n flip a few years ago) looking to buy land with cash (30k or so) and put a new modular home. A couple issues with Credit/income on paper. Without too much detail I had to quit my W2 job 2 years ago to care for my disabled son and my wife is still working. My credit got negatively affected but we're in the process of building hers ( she had no credit nor bad credit) I think we'll have her credit above say a 700 in the next 6-12 months. We're looking to renew lease until June 2026 would like to move in new house. Our issue is income on papers too low to qualify for the an FHA or traditional loan. Her mother is willing to (co-sign) and has excellent credit and debt to income ratio that will more than allow but I'm not sure the best way to structure this for the house to still be in our name? Would she need to be an owner occupant in the eyes of the lender. Would it be wise to buy the land with cash we have or utilize as down payment to avoid PMI? Forgive this not being investment focused exactly just looking for guidance from some experience people