Severn, what do you expect to pay someone to build that for you......because a well built Severn with all the electric and electronic parts working plus materials you are looking on at least 800. 1000 hours to build properly and professionally plus all the materials and parts on top of your kit.
I know the kits personally as I have had all three 1:12 scale boats that Adrian has for sale, Severn, 2 x trents and a Tamar...........and never had the time to build any because of the length of time they take to build nicely and properly, and of other projects..........
Took me around 800 hours to build the last two sailing model lifeboats I built and around 1000 hours each for my three motor powered classic lifeboats ( that time was each.......not all together)..........and the Severn is a brute to build anyway..............that is why they are so dear.
I would think about your money before you start asking someone to construct it, because if they build one in less time, then they are not doing justice to it and skimping somewhere.
neil.