How to implement the sale of non-standard products through an online store?

Question

1C-Bitrix

Hello. We have an advertising agency. Now the site is implemented on Joomla with 400-500 commercial articles for SEO. www.laserhall.org
We decided to move from an article site with commercial articles to an online store. We have a division of goods approximately 50/50, we can create the first 50% with specific goods, for example, "Information stand 500 * 900" and set a certain price for it, but the second 50% of goods are products that are considered very specific, for example, banner printing, which depends from the square, the density of the banner, the number of eyelets (this is a whole calculator) or the nameplates for which the minimum order is 500 rubles, and then it depends on what technology it is made of (sublimation, laser engraving), on what material (plastic for engraving, aluminum, Spectrum, alumamark), what size it is and so on, and most importantly, people often just send a photo of the nameplate and say "I need one" and they will not even go to the online store of finished products,
How is it possible to combine the sale of goods READY and UNDER ORDER in the catalogs of an online store on CMS Bitrix. So that a person would go to the article, read about the nameplates and use the order form, and not buy a specific product.
How to combine in the catalog the goods that a person can throw into the basket (print, stamp, stamp equipment) and a couple of nameplates that he wants to order from a photo and for which the price will be set only after we draw them, calculate the technology and name the price. Those. Are there custom-made goods in Bitrix, for which the price is determined later?
I really ask for help, since for the second week I have been racking my brain choosing between different templates from the marketplace and I can’t understand whether it’s really possible to realize my wishes at all.
From the templates for implementation, select Aspro.Optimus or a storefront (but there is no basket) Aspro.Corporate website 2.0.
I don’t know how to work on payment, I don’t really want to pay for ideas that are not suitable, especially for prepayment, but I’m ready to send 500 rubles. for an IDEA (which is usually not difficult for professionals in their field to implement in their minds) that suits and pleases us.
Please do not be offended by such a proposal, everything is connected with my lack of knowledge of the Bitrix product and it is possible for someone to come up with it simply, but for someone it is difficult. And perhaps because of my amateurishness in this CMS, I set such a price.
Well, then we plan to order the implementation of this idea.

Answer 1

1. for implementation choose Aspro.Optimus

   - I recommend, excellent solution
   

2. the first 50% we can create with specific products

   Start with regular goods
   
3. For the second half, for good, you need to write calculators. The Bitrix API allows you to add to the cart and then create an order for arbitrary products. Those. the order will contain a calculated version of the item with the specified attributes and price