Hello, we are a spanish players youtube channel, and want to support this invention: https://igg.me/at/adaptem
They are adapters which you don't must to change your original bases to new round ones.
We have made a table with the exact size and adapter for each Games Workshop model until now: https://zonamuertagames.wordpress.com/conversion-
de-peanas/
We wish this help you, and please, support the project: we want our adapters too!