I need a Shopify Developer

Hi, In my site [login to view URL] I am selling electric bikes... I would like to have the possibility to have a "basic product" e.g. A basic Bike (not Electric) , and then the client to be able to choose from the collection of the Electric motors kits, the appropriate motor and from the batteries collection to choose the appropriate battery, and the to choose other services, like motor installation, in order to built his custom made electric bike. i would like to have the possibility in the "basic product" entry, to add the matching collection(s) for this product, and the client to choose 1 or more products or Services registered already in my shopify shop.. Actually what I want is the Client, by selecting one product, to be able to choose other products to add to his selected PRODUCT, and then to have the total price, for his selected products or services... Pls let me have your best price and time needed for this modification, in my products dashboard. Best Regards Themos Papalas