Integration of MODX and Yii Framework

I have a currently running web application website which was built using Yii Framework.

Recently our would like to build up a new website (content & application) which we tended to use MODX as the base CMS To speed up the development process, we planned to migrate the application that is already built on the Yii framework into MODX while MODX will serve for new website content.

Do any had the experience on that?