A good media blast is not a bad option. You can even leave it assembled and mask areas you wish protected or left original. If its really THAT clean, you might think in terms of preservation vs re-finishing. If you do media blast, some places offer an "e-coat" service after blasting. Well worth having it done since the mat'l used costs a good sum of $. It`s basically an epoxy base primer to protect the bare steel until the surfacer is applied. PPG epoxy primer is about $200+ for a gallon primer and catalyst. The rest of the process of re-finishing is fairly generic. Good luck with it.
