Customise Shopify plugin Bundle Builder by Agile

Hi,Every one.I want develop a shopify app,it is shopify bundle builder,I want create customizable product bundle pages.With proper customization of the Bundle Builder Shopify app, I can create the perfect blend of dynamic bundles, so customers can pick from your existing product or to mix and match products to create new ones with inventory, variants & images all synced in real-time.
Here is three reference page：1.https://www.greetabl.com/builder
2.https://happyboxstore.com/products/build-a-box
3.https://shopmindfulgifts.com/apps/builder?b=DH4B8HgbwC6wU0snqDM0h965