Provide details on the general construction and workmanship of the model.

Design for Tubular Solar Still

1. Provide design details, an explanation and demonstration of the design.
2. Explain how the design is innovative.
3. Provide details on the general construction and workmanship of the model.
4. Provide supporting drawings.

https://link.springer.com/article/10.1007/s13201-019-1093-7#Sec5
(Pls use this design).

You need to do designer role only ( you can find all about designer role in the following documents).