Multiple configurable products as a bundle

This is not possible out-of-the box with Magento.

There are a few community extensions on Magento Connect - I have not used them personally. They used to be more prevalent - even Classy Llama had one. There was also one called Package Builder that I cannot find anymore.

So this might be your best bet:

Configurable Bundle by Wizkunde

https://www.wizkunde.nl/magento-2-configurable-bundle.html

Configurable products by Brim

http://www.brimllc.com/2010/12/magento-grouped-products-containing-associated-configurable-products/

If you want to forgo the idea of using bundles, Grouped Products offer the ability to add configurables to the group.