Ghost Ark is better, but if you want to distract opponent from some other high value target - doomsday ark is good for that(we dont have alot of large blasts, or any blasts and templates for that matter so danger of s10 ap1 primary weapon ,DONT FORGET it, can setup stuff for ya - someone WILL come for it into your backfield).
So that kit. Assemble engine part (with driver and nozzles).
Be very careful with it - watch driver spine connection and hand over controls position - it can come out badly, dont glue it by instruction, prefit it or glue VERY lightly by superglue so you can snap it off.
Than - you gonna see that damaged warriors slot nicely into the barge - dont glue them - they're nightmare to paint in the ribs of the Ark.
If you dont glue warriors and canon fitting hole in - you can easily insert doomsday canon in there for some experiments

it will be upside down - but good enaugh.