Hey Venkat, not necessarily asking for the moon, but certainly looking for something a little different than Ubercart provides. At its core, Ubercart is good for selling actual products or individual services that can be presented as products. For something like a custom product builder like this, you'd create the form yourself and then use Ubercart as a sort of behind-the-scenes framework. For example, you can make a custom module that will gather the customer's information and then add a product to the cart and go to the checkout page without the customer ever really knowing there are product nodes on your site.