Migrate and modify existing WP site to new WP multisite

Migrate existing multilingual WP site to a WP multisite (one per language) on a new hosting. Modify database, changing custom posts to standard posts and using tags instead of categories. Maintain secondary database (venues). Multisite will be set on on specified hosting as a test site and DNS will not be redirected until site is ready. Large database (+50,000 posts) Set up post links between sites (one post, three languages). User reviews will be kept in their original language and visible in all 3 languages. Each multisite will have all the same information (island, cities, venues, posts, etc.) and migration must be language specific (ie. German version to german site, Spanish to spanish site and English to english site) Google analytics code will be installed. Include breadcrumbs. Facebook pages will be connected (correct Facebook page to correct island and language version) and cron functions maintained (facebook feed). CDN Cloudflare will be maintained. Install new premium theme (to be supplied). Must include child theme for custom modifications The following plugins will be installed and tested. Banners, Yoast SEO, Search, Image resizing (for thumbnail and post), post linking across sites (User can flick from one language to another on the same post) Mailchimp integration will be included. Maintain 404 pages. Include/modify microdata (for restaurants and events), including dates, reviews, price, cuisine, image and rating. Some modification is required as info is available but not coded according to [login to view URL] Payment will be 100% escrow (ie: no money will be released until the project is completed, but the money will be placed in escrow, so it is committed). ONLY programmers with multiple positive referrals. This is NOT an easy project, so please read the briefing carefully.