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.
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.
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.