31761 Autocad Indoor Soccer Pitch

I am looking for a designer to simply plan out a few indoor football stauium designs using Autocad. I require some autocad drawings for a roof truss/beam to clear span 200ft. (this means the roof has to be 200ft in width) The stadium will hold 12,000 spectators. The dimensions for this stadium are 350ft x 200ft wide. (this includes the pitch and spectator seatings) Also if this designer could give us information on a developer that could actually plan and build this development it would be great! Otherwise simply the Autocad detailed designs are ok. On approval of the designs there will be a substantial bonus if they are satisfactory.