I have always wanted a Rolls Royce, however, money is a problem for me, do you have any suggestions on how I can own a newer Rolls Royce without spending hardly any money? Also, I have always wanted to own a large apartment building in San Diego, at least twenty units. Again, money is a problem, how can I own my dream, free and clear, without spending much money?
Starting to get the picture?
Some jobs just can not be done on a tight budget. Think about what is involved with you doing this job. Do you even have a work table that you can lay it on? How much time are you going to spend preparing your shop to even handle this project? Perhaps you are already set up to handle large projects such as this, even so, you are not going to be able to do it on a budget. I think if you were set up for doing these projects, the question would not have been asked.
Figure your shop preparation time, materials, time spent actually doing the job. How much work could you have produced in the time you are going to spend on this project? Make sure you are not losing money by taking on this project.
There may be other reasons for taking this on, perhaps your customer is a regular who spends a lot of money with you. That is not a reason to work at a loss. What is the point of having a "good" customer if you have to work for free?
Figure everything out as best you can, then give your customer a proper quote.
John