Yes, I see in some ways how you can do it now.   A simple product has other simple products Associated to the product ( not just simple with price adjustments ).

This works - although I was expecting to be able to do this with grouped products.

The main thing that's missing now ( I am using checkboxes )  is the extra information on the selected checkbox.  the price shows but it is missing:
- The Old price ( where it's crossed out )
- The Catalog price ( if needed )
- Tier prices pertaining to the logged-in person ( or not logged in )

I am getting a developer to look at this but I was kind of expecting it to already be in the themes ( maybe there is some code in one of them for this? )

One other thing - in Magento you can easily use product attributes and helpers in the framework to make a product attribute act like a "custom field".
The implementation of that in Grandnode is very different though - you can't really set that up and make it mandatory.  A big gap in functionality there!

I would say that either implementation through product groups - or a separate plugin for "custom fields"  would make the world of difference here.  It should be much easier to do this in MongoDB without knocking performance.

Cheers
Martin

And sorry one more thing - the experience for the end-user for multi-currency should be seamless. Not seeing an invoice with their currency and then logging in and seeing the base currency.

I have many customers who don't even know they have purchased from another country because the order arrived so fast and everything was in their own currency with their own taxes  etc from the start.

Cheers
Martin