chris
yes it does cost when you add it up,
the deck jig are normally built for the job and buy the time they have two hulls built in them they are normally buggered (or close to it)
the deck jigs are only a small part of the cost as well you should be able to built it for about $150.00
if you decide to build, build the two hulls at once ,it's really hard to build the 2nd once the first one is finished.
Good luck with your choice,as nick said it can be frustrating but rewarding
richard