We have a customized Large Flat Short Magnetic Flight Stand for the Ghost Ark and Doomsday Ark, meaning it has a customized bit that fits underneath the model neatly with no drilling or major putty work required.
[Buy Product=doomsday-ark-custom-flight-stand-kit,Variant=All]
For a base, The Doomsday Ark comes with the standard 60mm clear base, though the 120mm oval base fits the model substantially better and supports it better. The game base size on the Doomsday and Ghost Ark does not matter so you are generally free to use whichever base size you would like.
[Buy Product=bases-premagnetized-warhammer,variant=30427499626580]
[Buy Product=bases-premagnetized-warhammer,variant=30427499921492]
If you are using a 60mm clear skimmer base, use the self-adhesive base magnets for an easy no-drill base magnetization.
If you have a larger Games-Workshop base, use a pair of Large Thick Flush-Fit Base Magnets, 6mm x 2.6mm
[Buy Product=gw-flush-fit-base-magnets-large,variant=39439165882452]
To magnetize between the Doomsday and Ghost Ark is a fair bit of cutting and magnetizing, so we have not gone through the process ourselves.