I Don't think it is really worthy,but there were people who bought the single cab before the Vigo arrived,so for those people it would be worthy.In a few places in delkada the Vigo body is available,it will costs around 1M for everything including all the costs (thats what they said).But now don't think it'll be useful.When my father bought his Hilux the Double cab was around 10M and the single around 2.6M (not sure).But now they are damn cheap.And all the cabs including single comes with the Dual purpose registration