Hello Sir / Ma'am,
I have gone through your proposal, and it is a standard implementation of google app script, in your google spreadsheet, I can deliver the tested product in under 5 hrs of time (incl. meeting and discussion).
I have 3+ years of experience in google app script development, and I assure you a quality product adhering to the standard industry practices to ensure modularity and robustness.
Looking forward to work with you
Regards
Murtaza Sadriwala