Custom Module / Addon

Hello, we're interested in some professional work and we're willing to pay, the price can be discussed.

We are in need of a module where we can add some price parameters.
Let me explain further...

ATAC sells foliage, banners, display-systems and such, and we are in need of a module/addon that can let users choose from full (123cm) or half (61,5cm) which has a differential. Also we need quantity in this category to be replaced with "number of meters", as they can specify how many meters they are interested in buying.

We set the price of 1 square meter, which then of course is multiplied with X nr of meters customer wants - and the full width or half width choice adds to the price. All are ex. taxes.

It's very important that we get as professional result as possible!
Please let me know if something's unclear and wether anyone is interested. We're also in need of knowing a timeframe for completing such a project, as it's a Rush job!

I must also add that this request goes for Foliage only, and we should be able to choose wether or not a product is defined in meters/full or half width - Or if it's a regular product along with the other.

We have done custom modifications like these to opencart earlier.

I have sent a private message to you now.