I think it could be done! You would have to lengthen the frame on the right side though, how handy are you? Do you have the parts? I think my Genesis is @ 49" long and the frame for the ones with sideburners are @ 60".
I picked up a Series 3 Blue Genesis with a side burner, the cookbox is corroded through and I had to scrap it, just biding my time for another free one to come by on CL and hopefully be able to swap it out.