That's a v.v. expensive project!
Wish someone would come up with a cheap and similar DIY design for PVC pipes...... There are a few available online but build and driver details are sketchy at best. There are also a couple shown on youtube but the drivers, which can be sourced locally in India are quite expensive.
I already made one, which looks like Pluto or LXmini whatever you say. I didn't go by accurate calculations, rather use nearby values of TL length and acceptance of my ears.
Thanks for the link, Sumanta, but I had already visited both your Pipe speaker threads. I have a few questions to ask you about your build but we'll move to your own threads for further discussions. I'll give your thread a bump and take up our conversation there.