Yep--It will be overweight--and yes, it will be extra--and yes, it means a mini van or SUV at the destination--Been there done that when traveling with my mountain bikes and fat Tire bikes--Once you accept its overweight, then putting the helmet, shoes, and cycling clothing, and tools in with the bike becomes easy (up to 70 pounds total weight)--That all goes into a somewhat small bag that sits in the case, and not taking up room in my regular suitcase--
I get wanting to try and keep things 50lbs and under, and compact, and its great that there are products out there to meet each of our needs--for me, I hate having to spend the first few hours at my destination re-assembling the bike, and the last few hours disassembling and packing the bike.