Build SaaS for Perfex CRM

I need SaaS for Perfex CRM Project. Will also require other Modules to go with by stages. Some of the things I would need is 1. Single Code-based. Multi-Tenant Databases. 2. Offload Media to AWS S3 with segregation/security to isolate files from other Saas Users 3. Customization should allow Perfex CRM auto-update without being overwritten Please bid only if you have prior experience with SaaS and Perfex customization. So, the objective in this project is: 1. Convert / turning the app into multi owner / multi-tenant / SaaS 2. Create a registration and package selection system for that owner/tenant, with the ability to pay for the package and upgrade and downgrade if need be. 3. Create a super-admin / admin role that can perform CRUD operations for all data owner 4. Would need certain admin functions to be only with the SAAS Super Admin (Saas Solution Owner), e.g. Theme selection, A breakdown of some of these for the saas solution and changes to Perfex are as follows: Definition Super Admin/Saas Owner - The owner that signs up individual Saas Clients for the solution and is the Super Admin of the whole system Saas Client Admin - The Client of the Saas Solution Saas Clients Customer - The individual Saas Clients customers General 1. Saas Client Sign-up screen to sign in and select package type and payments 2. I Want to design the sign-up screen - will send the layout 3. Media folder needs to be a separate folder for each SAAS client, they cant have access to each other's media. As the Super Admin needs to preselect the main Folder where all the SAAS clients folders go in. (I am looking at moving this to s3) 4. The emails used in login must be able to be used across different SAAS clients. e.g. There is an Employee/client/vendor that works across multiple different businesses (saas clients) and would need to login to the system for each Saas Client. So I was thinking that the user logins can be something like USERNAME: abccompany\johnsmith(at)example(dot)com and xyzcompany\johnsmith(at)example(dot)com (this might be fixed with the wildcard subdomain.) 5. It would be nice if each individual logins can set their own theme from a predetermined list of themes (If this Possible). The SAAS Super Admin to set those 6. Single Code-based. Database for each Saas Client. (still not sure how this will work) Maybe give me your suggestion/ 7. Customization should allow Perfex update without being overwrittenCore Files not to be affected so updates can be done without changes 8. There will be a trial/demo option that is limited to x number of days 9. All changes need to be compatible with the theme loaded 10. **** Virtual Subdomain - [login to view URL] Saas Super Admin 1. Needs abilities to add Saas Clients, disable Saas Clients, change Saas Clients packages, add and remove modules that the Saas Clients have access to, Saas Clients, create a knowledge base for all SAAS Clients, etc. 2. Conduct a Perfex System Update 3. Needs to set up the SAAS Solution Payment gateways to receive payments for the saas solution 4. SAAS Super Admins need to be able to create a Knowledge base that will be available for all Saas Clients for their clients. 5. Needs the ability to Set up the SMS gateway and assign the number of SMSs to Each saas Client. so this option must be removed from the Saas Client Admin 6. Google reCaptcha options also needed for SAAS Super Admin and would be the master for the logins There is also a number of menu items I want to be removed from the SAAS client view that I can share as well If you serious with this project. Please provide/describe your design strategy. Please reply with costs and time Thanks.