Nice!
I don't think the ST cans will fit because IIRC the link pipes are angled differently in order that they can rotate up and down when fitting luggage, if they are similar to the ST4 ones they have a 90deg bend in them whereas the Monster ones don't..
Mind you I'm not sure whether the down pipes and collector from an ST2 will fit on the Monster, maybe they would. I'm sure someone on here will know.
I wouldn't bother too much about originality as far as exhausts go, open Termis are considered standard by most and considering how much they cost even s/hand it will only add value.
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Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers!
S4 Fogarty, S4R 07T, 748, Series 1 Mirage