Not difficult but certainly more time-consuming! That's the power of power tools.
The videos show him building a road frame but nevertheless he has to trim down the outer front of the chain stays where they are barely narrower than the BB shell winding flanges. But he advertises that there will be MTB kits. I'm curious how a MTB would work with another half inch on either side. A 100mm shell maybe? Or stays that aren't straight?
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."