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Hi Bojan,
Looks like a good solution. If I get your idea correctly, it's 2 counter wrapping straps around the hub connected to act like a long belt to which the roof is attached, so that you "simply" change motor direction (polarity) to open or close. The only thing I would be concerned about (especially with the tight fit crossways (2x25mm)) is that the 2 straps might snag, especially when one side of the spool is fully wound out and the other side fully wound in. In that case there may be a tendency for the wound up strap to slip off of itself and on to the other side. A barrier between both sides would prevent that, even through I can see there's not much room.
I also think it might be a challenge to get enough length of strap on to the spool, depending on how big your roof opening is, but I'm sure you'll nail it either way.
Another possibility might be a used (or new) garage door mechanism or sliding gate/door straight gear rack & motor.
Good luck
Best
JA
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