This is a bit expensive, but it is a true audiophile bargain. They keep inching up the pricing, but it is still a steal. The parts are worth more than the kit. It was designed by Jeff Bagby one of the best known DIY guys out there. Look carefully at the reviews and what they have been compared against. All very nice Morel Parts.
https://www.parts-express.com/solstice-mltl-reference-tower-speaker-kit--300-708
https://www.parts-express.com/solstice-mltl-reference-tower-speaker-kit--300-708