I need some pictures of how the trunk rain gutter goes thru the trunk floor, I'm sure it doesn't just dump on the trunk floor. Here is what I have now.
Here is what I am doing so far, I made a channel and I am running it thru the floor then I will put the back panel in where the trunk latch is and tie that into the channel.
The '33 has a trunklid and not a rumbleseat and the trunk latch panel had holes on both ends and by the latch that drained into the floor,i went ahead and sealed the holes up and made drain tubes for the ends.
you need a couple of pieces available through a couple of vendors but Steve's Auto Restoration comes to mind the 2 end pieces connect w/the side rain gutters(shown laying on the bottom panel in the image below). The piece attaches between the floor and the upper inner edge of the outer panel. It covers up the inner panel. Not used w/rumble seat