Alfack,
I'm sure you can still pick up the old woofer, either at Zalytron or parts express. (hopefully), as I still need two to complete my center channel. The plans are very easy to follow. This was my first DIY project. However, I did cheat a little, I had Elliot make the front baffles for me. He did an excellent job. 1.5" thick. I changed mine a little, I didn't use the T/L design, as mine are built into my entertainment center. We did a front port in a 3 cubic ft net internal voume. They sound very impressive.