Can I also have the plans? I am considering the 3pi for my best build but it's impossible to order anything since I live in Greece. I think I can get the B&C drivers locally along with B&C ME 45 horns (probably will have to make a few adjustments there).
So glad you can get the B&C 12PLB100 and DE250-8 locally. That will greatly reduce the cost. You can also build the crossover to save money. But I would encourage you to get the H290C waveguides from us. Otherwise, the crossover won't be right for the horn.
To keep waveguide shipping costs down, I would recommend using a freight forwarder. They will provide a USA address, which you will then use in the Pi Speakers cart, by entering the address they give you. This will make your shipping costs much lower. Do a search on the internet to find out what freight-forwarding companies are available to you in your area.
I am so thankful for what you're doing and for sharing your knowledge so openly. I feel that I have to construct the speaker now (I've already started ordering parts).
Constructing the crossover is the least of my worries. I come from a synth diy background so I am very familiar with designing and constructing pcbs. Cabinet making and wookwork is on the top of my worries, I will probably have to find someone knowledgeable here to construct it. I have a lot of questions about the cabinet making procedures but I won't ask anything now because I am currently going through the forums.
Concerning the horns I had the idea to order a horn locally and then tweaking the crossover according to your crossover technical documents (I've even downloaded AIM spice). It would be great if I could manage that, this way you learn something. However it can be very challenging for the first build. I will get the horns from you. It's not shipping costs that worry me (they are substantial though), what I am worried are the ridiculous customs charges when importing.
I am very excited about the project. Thanks again.