opencart modifications

Avg Bid (EUR)
Project Budget (EUR)
€30 - €250

Project Description:
I have a Mijosoft solution (Joomla + Opencart) and I need modifications in Opencart to comply with requests of my client.
For that, I need a package of modifications:

Modification 1:
In admin product list I need the next columns (in that order):
- REF (is the SKU with REF name);
- Category;
- Manufacturer
- Product Name
- Year (is the Model who I modified the name);
- All attributes (one column for each) In my case, i have a maximum of 7 attributes.
- All prices (the normal price and special prices)
- Weight
- Status
- Action
All columns sorteable and filtered

Modification 2:
My client have the next rules:
Sale and Delivery Terms:
- for orders exceeding 600 Francs, delivery is free of charge;
- for orders less than the above, a delivery charge of 20 Francs, will apply;
Discounts and Quantities
Red Wines, White Wines, Rose and Sparkling Wines:
- from 36 bottles, each of 750ml, 6% discount;
- from 60 bottles, each of 750ml, 10% discount;
- from 84 bottles, each of 750ml, 13% discount.
Fortified Wines (sweet):
- from 12 bottles, each of 750ml, 5% discount.
Discount on Pick up:
- from 24 bottles, each of 750ml, 3% discount.
Cash Payment:
- from 24 bottles, each of 750ml, 3% discount.
Cash Payment on Delivery:
- 3% discount.

I need the Opencart respect all that rules

Modification 3:
My client have 5 customer groups. One is final client and other 4 is trades.
When my client insert the prices, put the price with tax only in first group. All other prices is without tax.
When users show products (category; manufacturer; product; shopping cart, etc.) I want display in first group "Include VAT (8%)" or "Include VAT (2,5%) and in the other groups display "Exclude VAT". The other groups display the Tax only in shopping cart.

I need a budget for each modification and all.
I need support after instalation!

Skills required:
Joomla, Open Cart
About the employer:
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