Virtuemart modifications per client requirement

1. The price should be without the tax (simple modification in VM configuration) 2. The price should write as it price per unit, per meter...or piece. The price calculation should be correct. This can be done with VM custom fields but. We have the example and will show you from one website. 3. Quantity - The client wants the user can write not just click with arrows (now is only possible to click with arrows. It should be enabled enter value). 4. The cart layout should be modified. We are using a one-page cart plugin. We have the layout example. 5. On Virtuemart category page - client want to have on category page ADD TO CART button and price with unite (per unite, per kg,...like is explained before in point 2) We will provide you full description with example links.