I want help in Opencart (MijoShop) dev -Bespoke Duty/Vat and shipping

We have a client who vends wines which are either purchased to be shipped to the customer (as standard) OR purchased as an investment as well as stored in Bonded Warehouses. When items are stored in Bonded Warehouses they aren't subject to Duty or VAT charges. There are a few advanced calculations that are essential surrounding VAT as well as Customs Duty to be paid. Numerous delivery options depend upon what duty and vat is applied.

We would lie to know if you can deliver a quote to develop this system into MijoShop.

Specification

Process at checkout stage-

1) Select Shipping Location
2) Calculate Shipping Cost
3) Calculate Duty
4) Calculate VAT

Shipping Address
The client would like the standard shipping address selection with the additional facility for the shopper to be capable to select from a pre-set list of Bonded Warehouse Addresses (as these are designated authorised facilities so there are only 5-10 of these).

Duty-

Duty Status - Additional Field to be added to product

Desired Skills are PHP, Ecommerce, OpenCart