KG, should be a fun project! Also pay attention to JBarca's write up, if I recall, he did NOT have any roof leaks...his issue was that the side wall of the slide had no drip edge, and rainwater running down the slide wall was traveling around to the bottom and wicking up into the floor through abraded holes in the Darco underwrap.
There are many ways that these slides are built, both floor materials and how the bottoms are weatherproofed. I have some issues with mine and have been waiting for the "right time" to take it apart...hate to do it in the summer and hard to do it in the winter....
Based on your skill set, you'll find it's not hard to fix once you get it apart and see how it's put together.