I am planning to refurbish a colt 1911 pistol i just acquired in a trade. May I solicit some inputs on gunsmithing costs (range lang or estiamtes based on your experience) as follows: 1. installation of front sight - dovetail 2. fitting of commander bull barrel. the barsto barrel that came with the gun is extended to government length. Sayang ata if i cut the barsto barrel to make it fit flush the commander length slide. 3. refinishing black chrome (frame, slide, and if possible beavertail, ambi safety, magwell, and slide stop) thanks for any info.