"Plastic" is the "Rich man's Paper" They are way out of my pocket range, so too is card stock some weeks. But i used to build plastic models back in the day, very expensive even then. A 1:72 Scale B-52 from Monogram set me back £30 approx, and the B-36 Peacemaker by the same company {same price... i think} lord know how much they would cost to purchase now
