These guys make custom 3D terrain for a various number of games that fit the official dimensions

I just submitted a request to them for making terrain to rune wars.

If all of you do the same I'm sure they'll make it

https://combatzone-scenery.co.uk/epages/e25b18fb-c32b-422a-8493-a8baeb0f1a17.mobile/?ObjectPath=/Shops/e25b18fb-c32b-422a-8493-a8baeb0f1a17