Wolf in Sheep's Clothing allows 3 Components to be hidden/disguised at a cost of 2 Power. When making a dedicated Q-Ship, it's sometimes necessary to hide more than 3 Components in order to pull off the ruse of being an easy target. Would it be reasonable to 'expand' the number of hidden/disguised Components at the same rate (3 Components hidden/disguised per 2 Power)?

GM fiat, otherwise no. The point of it is that you can hide your gunsbarrackssomesuch, not to completely alter your energy signature. You'd be better off with an eldar mimic engine for that purpose.

I'd also assume that concealing more than these three components would require a lot more tech - either DAoT level(more likely) something Eldar-y.

I would generally say no to expanding it.

If you did allow it I would make it cost. I would consider one additional component for a doubling of power required. So power would run up from 2, to 4, 8, and 16 power for 3, 4 , 5, and 6 components respectively.

Otherwise some for of DAoT or xenos component seems appropriate.

This kind of thing can offer a lot of power to players.