@ROOSTER The sidecart can be customized, though this will require custom css/js. So unfortunately, there’s not a toggle option in the admin to change the sidecart look and behavior. Of course, we’re more than happy to provide guidance on styling things if needed.
That said, if you’re doing a one-page site, it may make more sense to skip the cart entirely and take the customer straight to the checkout page, removing extra clicks. Let me know if you have any follow up questions.
@finlayconn Yes, you sure can. In fact, we use our own subscription functionality to bill thousands of users each month. You setup pre-configured subscription options or allow the customer to customize as needed: start date, end date, frequency, etc.
Also, you can do free trials, along with bundling subscription and non-subscription products together (ie: require a one-time setup fee and then charge $20/mo thereafter).
Subscription based products can be built with Webflow’s CMS, form builder, dropdown element, button/link element, or html embed. Here’s a nice clean example: http://theproteinballco.com/protein-ball-taster-box-subscription
Feel free to send over more information about what you’re after and I’ll put together a demo. 
Thanks,
Josh