B2B domain with individual inquiry and price for it

Avg Bid (USD)
Project Budget (USD)
$750 - $1500

Project Description:
at the final following points should be possible at this domain:

1) buyer visits the domain
2) the costumer created by drop-down menu his individual product (shape, size, coating, quantity, quality, ...)
3) and then get a result: price and delivery time
4) Products which we have in stock will be marked and also be declared eg "In stock"

1) insert products through CSV fileitems
2) There will be a lot of products, and thus prices, the price must be easy to change in different product form (plate shape, rectangular cubes, ..). At best I only change a percentage and thus all prices change by this percentage accordingly.

THEN: If this job is done as I imagine it, then let the products we have in stock are shown in an external Internet shop.

The whole is to be built on Drupal. Who wants to make it better in Magento, it can make from me too it.

Tell me your suggestions.

PS: We need it to get work in German-Language!!!

Thank you

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