Well,please do not start a thread with "Announce" unless you've got something to release or atleast until sufficient work is done.
Please take a look in the forums and learn how this forum works.
I've noticed that almost every thread you open begins with "Announce". This clearly shows that you're new to the community and dont know how this forum works. Moreover your other statements in your previous threads suggest you're new to maemo too. And you have even clearly mentioned in one of your posts that you dont have any experience with Symbian and havent even used it once.
If you've already started work on your project, you can let the community know it with a thread starting with "WIP" or Work in progress. Announce it only when you've got something to show off to the general audience here.

Now coming back to topic, just because you got the source code doesnt mean that its just a matter of compiling it and voila! Its done!
Its not like coding in school. Just because I learnt C & C++ in school and learnt how to compile basic applications like a calculator doesnt mean compiling an OS works the same way.
There are certain hardware elements which are closed in the N900, for example, the telephony. Thats why we are still dont have phone calls working in NITDroid when everything else works as it should. The devs are still trying to figure a way out to make use of these closed components.
Then there are certain constraints in Symbian, one being, till now it was designed for nHD screens ie, a resolution of 640*360. Hence certain UI elements need a rewrite. And Symbian 3 is more or less designed for capacitive screens but I guess we can get past that.

So, in short, compiling your source code would theoritically do nothing. There is a lot of work behind an OS. Like hardware adaptation for example. Feel free to check out the Meego & the NITDroid threads and you'll get what I'm saying.

Till then, my best wishes on your work and I'd like to see you reaching your goal. I was a dedicated Symbian user before I switched to N900 and though I personally dont see any benifit of porting native "unhacked" Symbian to N900, it would be great knowing the N900 can boot one more OS.

Cheers!