Glue up on the Frugalhorn. It isn't that difficult to build. And its true you can never have enough clamps.
The next video will have the polyfill, driver and binding post install. I hope you enjoy.
Just to whet your apetite, I've made a second test mule of the double fold voigt pipe for a Visaton FR8 3 inch driver incorporating some fresh design ideas. I haven't heard it yet but all my fingers and toes are crossed.