Really? Your reply really does show your ignorance, about boat builders in both wood and steel.
To repeat, you turn up to all the good canal boat builders with the budget and attitude you have shown here and you will not get very far. I suspect you will be shown the door very quickly and possibly in very basic Anglo Saxon language!
I suggest that you start listening to the numerous experts on here and act on what they say. I also you suggest that you get out from behind your computer screen and start actually visiting the real steel boat builders who know what they are doing and don't need computers and CAD to build fine and excellent boats. Go with a decent, respectful and open attitude and you might find that they will actually talk to you, discuss your requirements, correct them where you are quite obviously wrong or impractical and may even offer you a sensible and reasonable figure.
The answer totally lies in your court, but you need to change your attitude.