DIY Vifa X25TG / PL18W009 speaker advice

Hi guys

A friend asks for help in diy-ing a pair of 'reference' quality bookshelves. I initially chose speakerbuilder.net's Dayton III design but alas shipping of the drivers will cost me $100 so i decide to get drivers locally.

SS's revelator and 18/8546 was too much dough for his liking so i reccomended Vifa's new tweeter and the excellent (from what i read) woofer

The problem is i only have Win ISD software and a series crossover spreadsheet from a great site on the subject to assist me in creating the speakers. Im quite sure these are insufficient. Any advice or tips?

C h r i s