Can I create dimensional-based delivery rates?
Unfortunately our system currently doesn't support dimensional-based delivery rates, but we are currently working on a system for it which we expect to be ready in the first quarter of 2017.
In the mean time, if you have particular large or 'odd' shaped items then you could either:
i) set a specific delivery rate for a product (when adding/editing the item), or
ii) use delivery pricing based on weight and set the weight of large items artificially high