Looks good, dont forget to make the 997 clone you need to change the wheels and the mirrors.
I havent seen any 997 mirrors up for sale - YET!
At that price it seems a better option for an early 98-99 996 upgrade than to either the clear front lenses (£300 -£350) or to the facelift....
IMHO I think the days of the purist 911 owner when everything should be original are, in part, over.
The early 911 SC/Carerra and 993 were traditionally left as-is and it was frowned upon to play about with them and its really only the 996 onwards where it has become more acceptable to modify (improve?) the car. I would imagine this is in part due to the more modern design (some might say rather bland), more on the road and of course an abundance of kits and specialists out there.
To upgrade to a 997 look depends on your own personal taste. If you want a clone then you need to change the wheels & mirrors and the back end. If you simply prefer the look then its probably worth going for.
As far as depreciation goes, I think it will make it more desireable to many people but not by the 3-6k that it will cost to do the job properly!
I think!