Home Buliding and Interior Design

I put a contract on a townhouse/condo in April with an earnest deposit of 5K. I did not have a credit score, I make good money and have been employed for a long time, My parents are putting down a large down pymt. The LTV was about 60%. The Builder was offering 10k and two years HOA fees if I went throught their lender. I did and within a week they said they could not do the loan in house and sent it to a broker who also said they could not do it either. Two months passed while, I heard nothing. During this time, I picked my selections for the house and met with the construction team, going along with plans as usual. The sales and mortgage team all said ” we’ve seen worse, you are okay especially with that down pymt” . I went three weeks w/o returned phone calls and finally was asked for info for a non traditional credit history. I gave checks, and letters all with perfect payment records. One week later, they denied the loan. Do I go elsewhere to finance or to another builder?
to answer Jamesnbarnes question, they said the no tradelines ( no score).

After looking at the entire situation, I realized that my file sat a the mortgage company without any review for 6 weeks. Finally when I started to ask questions and ask to speak with managers and finally the regional manager, I got a someone to look at it and then in two weeks, they glanced at it and without asking any questions or requesting additional info, they denied it.