Questionable.  Never worked on a Porsche...especially a Boxster?  He's going
to have a steep learning curve to find how everything is placed and works.
You'll need some kind of shop manual (Porsche=expensive; aftermarket;
on-line service info) and a really good mechanic who learns quickly.  Pretty
much everything that has to be done to the engine has to be done from the
bottom.  Proceed with care!

Regards from Texas

Even the porsche mechanics do not really know what they are doing.
most of them just hook up the car to the diagnostic computer and
replace parts.  This is what we call - fixing the symptom and not the
problem.  
I have had bad experience with the porsche "experts" with my 99
boxster