OSCOmmerce Shipping Zone Changes

We have e-commerce website that was build with OSCommerce. We need to change the current shipping module “[login to view URL]” it currently shows to the country and we need it to show to our the State/Province. The “Zone 1 Countries” in the admin panel it should have 4 groups (see matrix attached) with all 4 provinces. There is only 4 because some have the same delivery charge (see attached matrix). We will have to add more “Zone 1 Countries” and more “Zone 1 Shipping Table” the Admin panel. 1. /includes/modules/shipping/[login to view URL] 2. /includes/languages/english/modules/shipping I want to use the “Products Weight” in the Catalog/Products/ to determine delivery rate for example, so product MFL0001 will have a weight of 1 in its product description, and ‘n shipping price of 4.00. Zone 1 Province Comma separated list of two character ISO country (Need to change to Province) codes that are part of Zone 1. Gauteng Zone 1 Shipping Table Shipping rates to Zone 1 destinations based on a group of maximum order weights. Example: 1:4.00,2:3.00,3:40.00,4:30.00 Weights equal to 1 would cost 4.00, Weight equal to 2 would cost 3.00 etc for Zone 1 destinations. Zone 2 Province Comma separated list of two character ISO country (Need to change to Province) codes that are part of Zone 2. Western Cape Zone 2 Shipping Table Shipping rates to Zone 2 destinations based on a group of maximum order weights. Example: 1:11.00,2:9.00,3:240.00,4:180.00 Weights less than or equal to 1 would cost 11.00, Weight equal to 2 would cost 9.00 etc for Zone 2 destinations. Zone 3 Province Comma separated list of two character ISO country (Need to change to Province) codes that are part of Zone 3. Kwazulu-Natal, Limpopo, Free State, Mpumalanga Zone 3 Shipping Table Shipping rates to Zone 3 destinations based on a group of maximum order weights. Example: 1:5.00,2:4.00,3:80.00,4:60.00 Weights less than or equal to 1 would cost 5.00, Weight equal to 2 would cost 4.00 etc for Zone 3 destinations. Zone 4 Province Comma separated list of two character ISO country (Need to change to Province) codes that are part of Zone 4. North West, Northern Cape, Eastern Cap Zone 4 Shipping Table Shipping rates to Zone 4 destinations based on a group of maximum order weights. Example: 1:8.00,2:7.00,3:160.00,4:120.00 Weights less than or equal to 1 would cost 8.00, Weight equal to 2 would cost 7.00 etc for Zone 4 destinations. I don’t know how to explain it easier. Maybe even you will have a better idea for a new shipping module? Please advise.