I tried blowing up rawens enterprise to the biggest I could for a 18'' long model. unfortunately, there are a lot of things that are magnified and make it a hard build. I think that if I were to do it again, I would print the saucer top and bottom on label stock and then adhere onto cardboard or chipstock. regular cardstock is just to flimsy. im also thinking that rubber cementing foil on the inside to block light is good, ventilate fumes, and then just poke thru the windows with a small blade screw driver. as soon as I make anything that looks good I will post pics. also just for a note, that poster foam board, once washed in a hot shower becomes flexible foam like a wetsuit. so you got a sheet that is flexy. I think it could make a large Pilsworth spindrift. and combined with leaving some parts stiff, you could make a 1/350 enterprise. or a large Jupiter 2.