Hi, we have a very large custom build php site that we want to bring into a framework like silverstripe.

Key component for us is being able to import as much php and html as possible of our existing site into the framework as easily as possible and for us to easily manage our own modules of code within the framework.

How can we do this, what modules or processes do you recommend we study ?

If there are developers that have successfully done a big custom built site integration into silverstripe please get in touch for a phone call only to discuss with us.

I know there was a previous question similar to our posed on the forum at http://www.silverstripe.org/migrating-a-site-to-silverstripe/show/23450 however the answer at http://www.silverstripe.org/general-questions/show/18017 didnt help us out so we just like further input if thats possible,

We did also check out the Announcements section in this subject area and other links relating to migration but havent found the solution yet. thanks Mark.

We've done drupal and wordpress updates but nothing from a custom PHP build. Migration depends on how much of your content is in PHP and static files vs in a database (which is a trivial copy operation vs a file parsing situation)

You could try the static site connector for importing pages based on HTML (note I have not used it but in theory it sounds good).
https://github.com/sminnee/silverstripe-staticsiteconnector

Also see the connectors for drupal and wordpress to checkout examples of importing those services and any help you can get from those

https://github.com/ajshort/silverstripe-wordpressconnector
https://github.com/silverstripe-droptables/silverstripe-drupal-connector