Quote:
Originally posted by bell
i would say start with a dremel or jig for the fiberglass/abs....then use a drywall saw for the foam.....a tight circle is going to tricky with a sawzal imo.
can you get a hole saw that big?
if you're stuck with the sawzal then cut/grind the blade so it's thin (the back side....not the thin side), it'll make getting an accurate curve easier (thick blades don't turn tightly easily) i think that made sense 
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I've used a Roto-Zip cutting piece in my H.F. dremel knock off. It will cut the fiberglass but a hand held hole saw is a lot quicker.
That's it, two of the holes can be done by hand. The other two cuts through the thick foam and ABS can be done with the sawzal.
I have a carbide blade pack by "boa", the little one (thin) looks like it can do tight curves.
EDIT: My Roto-Zip is still in several dozen pieces, POS.