Custom Variant Matrix for WooCommerce

I need a custom-built variant matrix for WooCommerce product pages that allows customers to select quantities for multiple sizes (and optionally colors) in one easy-to-use grid.

Key features required:

Display sizes as columns and colors as rows (or vice versa) in a clean grid layout.

Quantity input boxes for each size/color variant so users can order multiple variants at once.

One “Add all to cart” button to add all selected quantities in a single click.

Support for price upcharges on larger sizes (for example, 2XL costs +$5.50 extra).

Disabled or clearly marked out-of-stock variants.

Mobile responsive and visually consistent with my existing WooCommerce theme.

Optional: Allow selecting one color at a time or multiple colors simultaneously (flexible approach welcomed).

Technical details:

Must work with WooCommerce variable products.

Clean, maintainable code with brief documentation.

Please share examples of similar work or WooCommerce customizations you’ve done.

Urgency:
I need this done quickly, so please include your estimated timeline and quote in your proposal.