This is very similiar to a system I came up with for a universal game, and 
to the 'universal task system' of Megatraveller.

I recommend defining a 'round' as part of the 'hit points' of a task, i.e, 
"To build a cabinet:Success Points:65, Round Length:1 hour."

Hell, you can even have 'damage resistance' to model tasks which are so 
difficult even the most skilled will not be able to apply all of their 
ability -- smithing mithril, for example, or building a computer using 
medevial technology.

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