Based on your requirement , it is possible for me to achieve via SharePoint list creation for this submission approval form with either using OOB features of SharePoint itself within the estimated timeline as 3 days which you have asked for.
regarding the work experience , I have been working as the SharePoint developer with 6 years of experience in the SharePoint versions of 2010,2013 and latest technology of SharePoint online.
I have worked on Customizing the list forms, share point pages, content management, workflows, web parts based on the site requirement, administering and maintaining and providing support for the site post live.
worked on the app model development, and developing web pages either using the server side and client side object model using the technology appropriate to achieve the same.
Installed and deployed SharePoint framework and platform on premise to develop the site in the development environment.
Please let me know if you need any more customization in the look and feel of the form.