Funny little spaceship, can slide on flat surface like the table of your bullshit job (launcher with rubber band coming soon)

Normal model size 45.80 x 64.50 x 15.92 CM (17,71 x 25.19 x 5.90 Inch)
150% model size    68.74 x 96.73 x 23.87 CM (26.77 x 37.79 x 9.05 Inch)

Layer size: 0.15 or 0.2 are good
Infill : As you want, 5% is enough but you cant put more for the weight  

Probably need support if you want print bigger