Trying to get a boom tent for the boat

We have a boom tent for 3SUM, but it is for the amas being out and it is quite big. Right now, our boom tent we are using is the size of a large handkerchief and it is somewhat adequate at keeping the hatch dry, but if the rain comes in at any angle but straight down, I get water down below. So, I am trying to figure out different ways of addressing this problem. I may have to lay into doing some serious buckminster fullering on this project involving fiberglass tent poles since 3SUM has some might weird angles. I want to keep this somewhat simple and not get too complicated. I want to be able to knock the boom tent down in 30 seconds or less. Right now, I have a clustermess on my hands.