Good idea! You should get a substantial saving over building up the equivalent Soul from parts.
Issues I can see are –
> Crankset-he 13 is PF30 whereas the Cotic is a conventional 68/73mm threaded. You maybe able to use a Praxis adapter?
> Headset- I think you may need a different one.
The rest should be good to go. Not sure how much you’ll be able to sell the 13 frame for though.