Thread: workshop base

Hey people, I want to build a timber floor for my 9m x 6m workshop, I am after some advice on how to construct the framework so it will be strong enough to build my race car in, the ground slopes away so the frame will be raised at 1 end to make it level with steel legs concreted into the ground, I can put legs in to support it anywere else that it needs to be. My idea was 90x35 treated pine, 600 spacing layed across in both directions, 22mm tounge and groove flooring panels on top, would this be structually strong enough?
Cheers