A Google Web App - Dynamic Order Form

Optimal interactive dynamic order form for a small business 1. Google Web App i.e. G Scripts, JS, G Sheets, HTML, CSS 2. Form will be pulling and pushing data from and to Google sheets 3. Dynamic build of HTML objects e.g. # of div/option/select,etc will be dependent from other objects which are being updated by users (do not hardcode) 4. With calendar for same-day and advance orders based on Google sheets (with several dependents) 5. It would be a lengthy form in some instances thus the need of accordion or alike design 6. Parts of the order form: a. Calendar for booking delivery date and time b. Product to choose and quantity based on inventory per day (present day or future days) c. Several sub-products to choose based on item letter b d. Accepts additional order (loop for b and c) max counter is based from active product list in Google sheets e. Accepts customer info: complete name of the user, recipient name (if user is not the recipient e.g. a gift/present) contact # of the recipient, delivery address, pin location in G maps (if any) f. Simple captcha g. Generates invoice that will be shown at the end of the form (with incremental invoice #, product info, discount/promo, regular price, and other vital info for delivery, etc based on G sheets) IMPORTANT: As to not waste both of our time, please send a detailed and technical proposal as much as possible for me to decide if you can deliver or not.