Build a website for ordering online marbles

Request to please go through the attached document nicely. Also see the look and feel of home page we made already: [login to view URL] currently payment gateway will not do.. what i prefer is to use any CMS related shopping cart, like opencart in very nice way. but in admin panel, the logo and content of opencart or magento is to be removed, and the look to be neatly changed to certain extent with my given ones. Look like we can do this by any good experienced developers & designers in a week of time includes speed tests and load tests will be checked in [login to view URL] for above 90 scoring and in gtmetrix for 100 scores. Prefer: opencart / custom cart of yours. Highest budget is $200 (inclusive of all costs) as similar type of project we did few weeks ago, and the existing developer is busy with holidays. Note, all the images will be supplied by me, all the content will be supplied by me, and cms to have complete authority to change content of any place. Developer needs to give one day complete training on how to use the admin fully and also how to change the logos and other things of admin panel for me to understand to rebrand the admin in my company name.