The two new electric fans probably use more power than the whole of the original car. I found that my Kenlow on the Jag would get the charge light on the dash to light up when sitting in traffic. Fitted an alternator and it stopped happening, must be less than half the weight.
As it is a "new" engine that hasn't had any water in it I would be very tempted to go for the Evans waterless coolant, but expensive.
It really is turning into an impressive build.