elevation drawings/internal plan

I need a 3D model and architectural drawings following the design and information on the following website [login to view URL] the only change I require is a Change in the roof structure, instead of a warm roof I would like a cold roof with the insulation inside the roof cavity this would obviously lower the overall hight of the building I have also attached a couple of pictures of where the building will be placed, there is currently a crushed caravan on the site