There is a fuel tank standing in between the trunk and the back seat, so no long lumber unless sticking out the window. The trunk is pretty big; enough for 4 sets of clubs.

The passenger front seat back reclines all the way down so you can get quite a bit in there, an lots of room in the back seat area too. Not a wagon or a truck so no full size plywood but you can get a few 2 x 4s in there.