Create a simple task page where user can fill up fields

Hello,

I’m creating a wordpress theme for a client, and he requested to add a functionality.

There would be be a custom post type called “tasks” for 21 days, each day with a new task, each task will contain a brief text explaining it, Four questions and an image to be uploaded by our registered members (we are using a membership).

Now the challenge is how to create a system in our website where it would be easy to make different questions for each task and at the same time users can answer these questions and upload an image at the same “task” post type, and the entered informations would be stored in the database and displayed in that “task” post type, for the others users so that they can see answers from other members.

PS: like a commenting system for a custom post type , but with other fields, here the fields would be (question1, Q2, Q3, Q4, image).

I have tried to find a plugin for tasks, but they are generally to be assigned to specific member not created for all users.

I have tried to code it manually, but seemed very huge to me as i’m more confortable in creating simple theme development stuffs, not building a plugin.

Anyone could help me or guide me.