the hinges take about an hour to install
but forgive me but I had to laugh when I saw that picture. Reminds me of Dave and the dremel grinding baffles.
here's a quick Fix, the TP is made of abs plastic, go to Home depot and get some 2-part epoxy FOR ABS PLASTIC, put a piece of duct tape on the inside tp act as a backer, then put a piece of blue tape on the holeand cut away enough to expose the hole (hope no one heard that phrase last night) you do this so you don't get the epoxy where you don't want it. mix epoxy and fill hole, popsicle stick works great, allow it to crown SLIGHTLY , carefully sand when done, and touch up paint. I found auto zone and such has a good match to most of HD colors for small touch ups.
OR, drill a hole in the other side to match and make up a story as to why the holes are there, like, to let the beaver breath