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Based upon your description, it sounds as if the skylight is running downslope 7' and is 4' wide, is this correct? This should allow it to fit between the existing joists.
A few things you will want to know:
Type of roof--you mention asphalt, I am assuming there is insulation and decking under the asphalt. Is the apshalt roof a warrantied type--such as a Firestone or similar? If so, they are very strict about who installs penetrations into their nroof systems and an unauthorized install can void their warranty.
Slope of roof --you mentioned 'gentle" get the actual pitch--1/2 on 12, 1 on 12, etc
What is inside? drop ceiling, vaulted ceiling?
Where is the skylight in realtion to the peak of the roof?
All of this will factor in the installation and type of flashing/curb needed
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Eric
83 911SC/83 944
bunch of Honda 750s
69 Chevrolet C-20 Longhorn (family heirloom)
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