Hi we are in the process of exactly what you are talking about. We redesigned a Park 270E to our own specification. We used the northwest agent and can say mostly would recommend them. Particular staff very professional and helpful. The redesign was quite straight forward but has to be done within the parameters of a Dan Wood build. Be aware that standard options were not in keeping with a house of our size and we spent around another 60k particularly the electric upgrades, flooring and additional ensuite. We are just about to receive delivery 3 march happy to keep you posted this is the exciting stage!