I have considered getting it together to come to one of these shows Andre but tbh if they’re anything like they used to be many years ago you cant really get a fair impression of how things sound; too much activity and systems set up in less than ideal circumstances etc etc.
I just end up getting confuzzeled with the noise 
Anyway, from what little I can tell the 66’s look like they may be off to a good start with the basic design. Not too happy with the electrolytics though or the hardwiring. I had those back in the 70’s so they must be on their way out by now.
Still, if they sound okay, that’s what matter eh
Single spur balanced Mains. Self built music server with 3 seperate linear PSU, Intel i5, 16 GB RAM no hard drive (various Linux OS). Benchmark Dac2 HGC, single ended XLR interconnects/Belkin cable. Exposure 21RC Pre, Super 18 Power (recap & modified). Modded World Audio HD83 HP amp. Hand built Monitors with external crossovers , Volt 250 bass & ABR, Scanspeak 13M8621 Mid & Scanspeak D2905/9300 Hi. HD595 & Beyer 880 (600 ohm) cans.
The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts.
-Bertrand Russel
John.