To my knowledge there is only one 1/48 kit produced of the Seaking. It was made by Hasegawa but is now also produced by Revell after they leased the moulds. This kit is for the American version so it may be correct or not depending on which country you want to represent.
If you want the American version it is ok but the Uk, Australian and others all require changes to it eg the Australian version requires wondows to be moved and different sponsons for starters. Which country do you want to do?