Based on experience and from what you described, insurance will total it out. I see them total these out for just needing a new top.
As for what it will actually cost to repair if you do it yourself, can't say without pictures of the car & underneath it. Could be looking a a minimum of a new tans, axles, wheels, tires, suspension parts, most likely more. Not knowing total miles, year, work history, etc it is pretty impossible to say just from a description of what it is even worth. I have seen value as low as $1100 and higher.
I would set your expectation to be very low and them offer around $9k from your description.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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