DaasYochid: If you accept the gemoro and the Rambam that making cheese on shabbos is melocho d’oraisa, then, clearly, tosafos’ reasoning is right and the only reason why you could not build a house (actually fix a house-see tosafos- because building would not be allowed as you could do it erev yom tov) would be because of an extraneosu reason- such as “uvdo dechol”. However, if you hold like some of the other rishonim that “boneh” does not apply to “keilim”, then ,clearly, making cheese on shabbos is not a d’oraisa and hence, we could not deduct anything from it,as far as building (fixing) a house. However, we could still apply it to electric current,as far as an actual melocho goes.
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