Hi. If you are still searching for a solution for your Shopify store, please find a link to the Shopify app designed specifically for quoting curtains, Roman blinds, and other bespoke window coverings. 100% the best what you will find in the market for the shopify stores.
A link to dev’s demo store: https://www.curtainscalculator.com/products/roller-blind-example
And direct link to the Shopify app store: https://apps.shopify.com/plugincc-app