La Scala build

Have you tried Googling 'klipsch lascala plans'? There are dozens of plans and info online if you look as well as numerous reasons to not build them. Firstly the plans are technically 'Intellectual Property' and second, unless you can get the exact same drivers and same x-over they will not sound the same as the original. The plans may  be a good starting point  for self build but unless you have loads of time and access to loads of different drivers to identify which are the most suitable and best sounding I would follow the examples of previous builders.