APO Product Options, Variants

We use Advanced Product Options to offer our customers the ability to customise our watch range.
The flow is 'choose dial', 'choose case' then 'choose strap' with each stage able to add a cost.
You can also set a colour or image swatch in the selector but have it bring up a different full size image when selected.
It does everything we need without a £££ app design bill and the support has also been great.
You can see it in action here - https://www.kartel.co.uk/products/customise-your-kartel