Aren’t the A1 and E5 frames very different (A1 frames are old Secteur frames) ?
I can only comment on the carbon one, which I have. 6’2″ I have a 61 with seat tube on max extension. I do have silly long arms and legs for my height. I’ve flipped the stem, loads of stack washers gives tops and saddle roughly the same height. I’ve stuck some 48cm Nitto noodle bars on it.
Lots of bad points – paint is coming off, seatpost is wearing where the pack is, tyre size limited to 36mm, one of the rims badly drilled (only noticed when converting to tubeless), luggage points not compatible with any racks, etc
An absolute and utter joy to ride though.
Just did Wales coast to coast off-road, the guys I was with usually cane me when we’re on MTBs, but they were on CXers and I left them for dead on the rocky downhills (and they had 40mm WTB nanos, I had 36mm X’PLORs). I honestly think I could do the passports on it, yet on skinny tyres you could win a ‘sporting’ (i.e. non-TT bike) time-trial.