Welcome to the madness. Great purchase.
As far as the trunk, I agree. It may be cheaper to just replace the lid than have body work done on it and repainted.
There are two GREAT sources out there for used Boxster parts. One is Woody; AKA itsnotanova, on this forum. Here is a link to his posting.
http://986forum.com/forums/boxster-parts-sale-wanted/52469-parting-out-whole-lot-boxsters.html
Another great source is qualityporscheparts on eBay. Here is a link where they have a couple black trunk lids listed for
qualityporscheparts | eBay