(lacking)[lack] money ,it remains to be seen whether we can

lacking money 是修饰 it , 在这是指一种情况、状态。

换位置表达：
Whether we can put the idea into practice with the money lacking, it remains to be seen。
另一种表达方式：
We are not sure whether the idea can be put into practice due to the lack of money。

【英语牛人团】