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Sumo
You could buy some bitumen sheet (or see if local FB page has any going) and get some bitumen paint and patch the holes up. I used something called Black Jack and while it is horrible stuff it is defo waterproof and will help cover the holes and adhere the patches to the existing bitumen.
For maximum bodge you could get a tube of gutter seal silicone stuff and cover the holes. I don't know how long that would last though.
You can also get fairly cheap flashband which when you heat the back up with a hair dryer or something it will stick to almost anything. You again could just cut patches to cover the holes.
All the above are very temporary of course...
EDIT: After seeing the second photo I would probably buy a bitumen sheet and recover that and use some of the bitumen paint I mentioned. The effort and cost would be fairly small for a space that size.