Just for interest my measurements on my Scandal & Swift:
FRAME:
Singular frame with EBB = 2.45kg
Scandal frame = 1.6kg
A difference of 850gms. About 1 1/2 waterbottles worth. Add to the Scandal's weight a couple of tensioners to keep the back wheel straight and the weight of a tool to adjust them – in my case 85gm all up, which reduces the weight difference to 765gms.
FORK:
Singular fork cut = 1.12kg
On-One fork = 0.93kg
A difference of 190gms, or a bag of jelly babies. I like both forks. The On-One could be fitted to the Singular to save a bit of weight.
If you build with a suspension fork, then this is irrelevant.
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The Scandal frame is light and rides nicely, but not as nicely as the Singular. Both handle well.
The Singular wins out for convenience – eg dropping out your back wheel for punctures or getting it into a small car. There are no alignment problems when putting the wheel back.
The Scandal is more awkward. If your punctures happen at convenient locations, times, and weather, then the Scandal is ok too, but you still have to make sure the disk is properly aligned unless you can get the wheel exactly where it was previously.
Thus the total weight difference comes to 945gms if you use the Swift with its fork, or on just frame weights alone 765 gms.
A well considered build could get you a very light Swift or an ultra light Scandal.