I had to order the base off eBay because GW does not make the 150mm oval separately. It's MDF so it ads a lot to the weight.
Very happy with how it came out. I did as much as I could to copy the original model including the 3 twin boomsticks, the snagga claw with chain and spools and the rockets as the Jets.
The warboss is based on a Reaper Bones Mountain Troll model and is magnetized so I can put him on a regular base and run it on foot - to use the Redder Armor someday.
I got 3 150mm bases so the other 2 are going to go under the UFO's which will count as Megatrakk scrapjets.