Fred,See my reply below to Bill's comments on using other drivers than the ones he used in his design.
The Linus 1 plans available from me for the price of an e-mail to those interested. Rick Craig also would likely fulfill requests as well.
I would say that the Silver Flute 5" driver would make a good driver for a line array design but again this would be a new design.
As I suggested earlier, John Janowitz at Stryke Audio likely will sell his planar tweeters for much less than Madisound or Parts Express which would help meet your boogie price. The Linus 1 would still be my preferred approach as it would be a proven design that can be duplicated without the builder redoing anything. To me that is would be worth the extra $50-75 versus coming up with a new or iterated design.
Jim