Gnawholes Proxy that is stackable?

Hello there fellow ratmen,
For the last bit of my army I am missing the Skaven Gnawholes. Can't go into my first 2k battle without the faction terrain.
When I look at the models though, im wondering if there are any Proxys that are better to transport maybe? The GW ones surely look cool, but they don't look like they are stackable and it seems that they are going to take up quite a lot of space in my transport backpack.

I got a Miniature transport backpack with metal slates on wich I magnetize my minis.