too many problems...

第一, 30 $/时太高. 你老兄有没有研究过市场价格?
第二, 用的是什么methodology? 你怎么会东西都做来了才发现有问题? 没有milestone check 吗?
第三, SLA and SOW对于不能按时交货是怎么规定的?
...

Don't feel too bad, since it's only a pilot project. What are their credentials? Did you do enough homework? You are repeating some of the elementary mistakes most companies made years ago. You will learn by failure, so next time, be better prepared.