I got a lot of help and ideas from people on this forum while doing my tower speaker project. Several people asked me to post the results and costs. Bill from
http://www.monstertower.com was nice enough to post it on his DIYTOWER website:
http://www.bierbower.net/diytower/Docs/DIY%20HLCD%20Tower%20Speakers.doc Sorry the download is 1.5MB due to the pics.
Hopefully this will give someone else some DIY ideas.