Starting a Large project

[eluser]craig.hoog[/eluser]
Hello everyone,

I really need to pick your brain for a minute here.
I'm about to launch into the development of a large project (large by most standards).

What I currently contemplating are the core basics, and I wondered if any of the experts here could weigh in a bit.

1. Is CodeIgniter the right fit for a large project with many parts?
(Profiles, eCommerce, Inventory, APIs, Interactions)

2. Should I know anything before I go forward with my usual MySQL Database setup?
(Am I missing the fact that MongoDB, etc are the clear winner in this arena now?)

3. I have currently broken the application into "sub applications" like:
a. Admin panel
b. Client facing front end
c. Registered user panel
Does it make sense to make these separate CI apps (my current plan) or is there an argument for doing it all in one large CI project?


As far as my experience goes, I have launched eCommerce sites, blogs, various CMS systems and more with CodeIgniter, but this is my first forray into a large site that has the potential of thousands of users online at one time.

Any advice or directions would be fantastic. Just don't want to find out in a month that CI is a terrible idea for scalable apps or some other avoidable pitfalls.