It's an office LCD. 19" 4:3 .perfect .they do a larger bezal to fit 16:9 wide-screen but that's pointless because all retro games are 4:3 .As for installing a crt .prob prob wouldn't fit.
What kit and buttons did you order. I bought a pi last year with the intention of doing this but haven't got round to it. Probably as the wife would wonder where I was going to put it.