The problem. The store needed presentation and flow customisation that a stock theme could not deliver without heavy overrides — the kind that break on the next WooCommerce update.
The approach. Customisation was implemented in a structured theme layer with WooCommerce template overrides kept minimal and documented. Every change to cart and checkout was staged and tested against the real order flow before shipping, so the revenue path was never a test bench.
Status. Described here without client-confidential specifics; figures are not published. The case demonstrates the store-engineering method: minimal overrides, staged releases, tested order flows.