I looked very hard at the hymercar last year. It's quite something. For me though the downfall was the extra height, which means a lot of height barriers, including those on French tolls, will not be cleared.
The loo is very attractive, but then has a 335 sized tank I believe so if wild camping same problem of disposing remains but not an insurmountable problem.
However, I did drool, and also at the Westie club joker.