I think my question might be how are you going to capture the data that you might use for the load curve?
For aero…. I read a study a while ago that used a combo of CFD and other testing to quantify the effects of it. In short, a typical CIK bodied kart has a CoD of .8 and a frontal area of .570 sq/M (6.1 sq ft)
So you could use that as a base to see how much, if any aero you want to factor in for your testing/simulation. I guess it would depend on the average speed around the track, more-or-less.