5: Model-builder's activity
 22: Pooch in 'The Wizard of Oz'
 23: Copy editor's quarries
 25: Blended-family prefix
 28: They're passed on from father to son
 30: Ferris wheel and roller coaster
 37: Triangular sail insert
 44: More dry and withered
 45: 'The Gift of the Magi' device
 49: Old-time telephone feature
 50: Type of belly and barrel
 54: Helios, to the Romans