We ended up going with the Gokstad faering from Design studies of classic small craft and modern classics...
Thanks JS - that may well be what I'm looking for :-).
Thanks all. I've seen the amount of skill involved for making display wooden models like the Drakar, I'm not aiming for something worthy of...
I've 2 children who are studying vikings and are meant to build a model viking longship next week. Now I could just let them bodge a vague box...