Hello. I fabricate the Orion speakers and upgrade kits for them. They were designed by Siegfried Linkwitz. In my years of making many of them, I have incorporated some improvements to the construction and will share that information to those interested in building them. After purchasing the plans from Linkwitz Labs, I can explain the changes I have made. You can then consider including them if you choose. I do own a pair of them and use them in my primary audio system.