Philistine- Thanks for the info, that is also my plan at some point-PE cabinets and N2X drivers in conjunction with my current subwoofer, it will be my first DIY of any type have any tips??
My tips:
When you order the PE cabinets also order the polyfill...
I sent the baffles to the Skiing Ninja to cut out - Sean did a great job and knows the exact layout for the two drivers.
One of Danny's posts talks about removing part of the bracing inside the cabinets to minimize reflections.
Crossover - I did the first one my way, the second one following Danny's sticky on crossover building. Danny knows best

I used JPS wire, difficult to work with so don't use it (I believe Danny has his own wire now).
I got the Cardas binding posts, I believe Danny uses the Electra Tube connectors - don't use the Cardas.
That's about it, the build is pretty straight forwards. The curved PE boxes look good and are great value but are probably the weakest link, I would love to try the stacked baltic birchwood ply.......
I have an old REL Storm 111 sub, this matches the N3's perfectly and makes the combo really sing.
Good luck with the build..........