There are not massive differences between the Stadium v Short Course - its really only body/wheels unless you want to get really technical but for us folk at SHRCCC the body and tires would be the only notable difference.
I got my T4 cheap and looked at the converting option but in fairness I prefer stadium to short course so wouldnt convert it - i am sure for us running stadium/short course 2wd/4wd combined class it will be great fun.
I am thinking of transferring the electrics from my B44 and sticking some new electrics in the B44 and maybe just maybe i might take 4WD a little more serious and have a laugh with my Stadium