Quote Originally Posted by shawnlee28
Like this......?

Yeah, kinda like that. The way the frame appears, the transmission crossmember will be between the box sections. This won't add much to the frame. Depending on the engine height, a long x member could be added to the top or bottom between the box sections. This would provide some stiffness in the longitudinal and axial planes. There is still no strength in the box sections. Running a tube from the inside front corner to the outside rail in the rear of the box would take care of this and provide excellent longitudinal, lateral and axial stiffness. A frame this long and of that construction would flex like a wet noodle.
Do I overbuild? probably, but I have had enough of cars that the doors don't fit right and squeak like a mouse on speed because frame flex is making the body flex right along with it..
Don't get me wrong. I think he has done a fine job so far, but it can be better. It is a lot easier to correct a shortcoming before the car is put together. I speak from experience. The first one I built flexed so bad it broke the windshield.