I did buy the Ork Battlewagon Upgrade Pack and decided to add the Deff Rolla to my Ork Battlewagon.
Before undercoating the Deff Rolla I masked where the Rolla would be glued. I used normal masking tape for this.
warhammer, wh40k, flames of war, bolt action, aeronautica imperialis, star wars, models, news, views and stuff