The chroming needs some thinking.
Chrome is not like paint in that it can be neatly masked off. Further, a layer of chrome on steel is quite thick since it is first plated with copper, then chrome, which leaves a considerably thick ridge. Even worse, Chrome is a dip process by which I mean that you cannot choose an arbitrary shampe for the chrome to follow such as the countours of a lug or such. Imagine suspending the part of the frame, say the rear drop-outs in a tub of water. The water creates a straight line. That's where the chrome line will be. Therefore you cannot just chrome a small part of the frame. You have to chrome the entire fork, say, and then paint over the chrome.
Powder coating is also not the best process for a frame since you will need to machine off facing surfaces such as the BB, drop-outs, mudguard mounting points etc.