Yes if you are skilled in auto body repair and have the proper tools and equipment.
A car that has no roof is merely roofless, but the name for such a car that has a retractable or removable roof is a convertible.
We need to tear out a spot on our roof. How difficult is it to remove and replace roof shingles on our own?
The roof
no <><><> The first car did not have a roof at all.
roof scoop or sun roof
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Sun roof
A car without a roof is called a convertible
We need a grat to replace our roof it was bad then we had a hail storm.
This depends on the age of your roof. If your roof is relatively new you may just need to replace a few shingles. If however, your roof is near it's warranty limit you should consider replacing the whole roof.
replace the weather stripping in the doors with Silicone-RTV and leak test it by pouring water into the hole in the roof you cut with a reciprocating saw.
A gabled roof is the triangular portion of a wall between the edges. It is the sloping roof. Thus the type of enclosing roof the volume dictates the shape of the gable. If you built a room over the roof is not possible. So you replace the roof and raise walls and ceiling of the room and replace the roof.