Sales funnel creator

Hello,

I'd like to developp a sales funnel creator, like Clickfunnels, Teachable, Leadpages, Thinkific etc...

This is a huge project, so I'll have to ask the bank for financing.

To do this, i need to have an estimation of the price that you ask for that kind of project.

Please apply only if you did something like this before :)

Thanks !