I'ts an heavy remix from Necron Ghost Ark Fly Base by YTYtheThinker. (https://www.thingiverse.com/thing:3150854)
I find the original concept too massive and needed more stability (the front of the arch was leaning to the ground) and also an attach to the ark (The ark was just set on the support and needed to be moved separatly each time the ark had to move).
The new base is now compatible with the Gost Ark and the Doom's Day Ark. (my ark are magnetized so i find it important to be able to support both models)
It's 'attached' to the model so you can move your ark without worrying about the base.
The Arks are perfectily stable on the base (no more leaning).
The support is thiner.
On top of that i Adjusted the dimention to match the official one in heigt (about 1cm taller) and the base is now a 60mm.