Lovely cab! Looks very clean. If your screen has a nice burn-free picture just tri-sync it yourself by replacing the chassis. What's wrong with the bezel?
Scratches can be removed by using Novus 1,2,3 polish solution. Really works well. Cheaper than replacing the whole bezel. Worth a shot i think.
Well, You're asking how you can replace the chassis? In that case you better buy a fitting replacement for your tube and have it done by somebody experienced with this. You're handling with high-voltage here by decharging the anode cab etc. etc. You can probably find loads of info when you do a search here or on arcadeotaku.com but better stay away from it when not knowing what to do. Or look into it deeper first and get confident about it.