Decware DIY Bandpass Horn subs

Guys,
Has anyone out there built the bandpass horn DIY subs published in http://www.decware.com before ? Currently I have 2 10" long excursion drivers and I don't have its T/S parameters. In the website itself, seems that there are some easy to follow instructions to derive the dimensions of the subs (with lots of graphics) without mentioning a single word of requiring any driver parameters.... All it needs is a 10 driver to fit into the enclosure. Isn't this a DIY heaven ? Cheers....