Customise appearance of Bundle Builder App on Shopify Store

We have a website which uses the Bundle Builder and would like some support to maximise the functionality and alter the design to make it better match the rest of our website. Functionality: We are trying to support two types of bundles: - A 'Build your own' Bundle, where we'd like customers to select a set number of items from two categories. The basic functionality of this is working ok but we'd like some changes to the design as per below. - A wide range of predetermined bundles which incorporate different combinations of products. We want to use bundle builder to enable us to track SKU on each of the products ( which works fine), but also enable customers to make product substitutes from set categories (bowls vs finger food) if possible. We can't work out a way to do this without reverting to the 'Build You Own Bundle' setting. Ideally we'd this to show the selected items at a pre-filled at 1 quantity per item but customers could vary the selection based on their preferences. - We have a subscription option available for all of our single item products using the Subscriptions Recurring Orders app from Propel, and would like to enable this on all of our bundles. Design: Across both bundle types we'd like the bundle pages to appear like all of our other products pages, in particular this includes: - Having much smaller images of each of the products - Having the Main Bundle Picture and description to display at the top of the page - Having the 'add bundle to cart' option and subscription options at the top, rather than at the bottom. - Having the ability to include other product description information (in an accordion) at the bottom - Being able to edit the look of the 'base price' and 'bundle price' as this is currently displaying in quite a confusing way. - Being able to edit text size, colour and button appearance etc to make it more inline with the rest of our webpage.