Change the design of the website on Yii

Remote work on the site. You need to make changes to the design of the site on Yii.
You should know: CSS+JS+Jquery+PHP+Yii
Features: Multilingual support in PHP code.

Move the pages:
(1) main page
(2) login, registration, restoration
3) personal account (8-10 pages), the design is almost standard on all pages
(4) search
(5) make a basic blank page template
6) basket + order

Part of the current design is written with Yii:HTML tags, plus part of the functionality of the basket, logins, menu is implemented in the current topic with Yii and js tags, which also needs to be transferred to the new design.
The sites themselves and the sourst and targeting functionality are close to 90%.

You do not need to add functionality, you need to transfer it using Yii tags to a new design and to correct it in some places.
From the old design you need to take the functionality (js+Yii: login, basket, menu, etc.) + a with the new html+css+js

Write an approximate cost and time for the project.
I am ready to discuss each page in detail by Skype or mail, so that there is a TK for each page.
I'm offering to pay in stages.
Prepayment for 1 page, made, handed over, payment next, etc.