Hi Dave, getting a 4:30 ratio 9" screen is indeed hard. I found mine at www.pollin.de. but it is a 16:9 ratio. i built a black frame inside the 4:3 old screen front. so when looking at it you see 4:3 and when on its conemascopes it to 16:9. keyboards are a different issue, at least for my windows mod. i needed a very flat one, which when mounted can be flat enough as not to disturb clapping the fromt on as a dust cover. i dont think you will have that problem with your matra. you sound as if you have a plan so i am really curious. the matra has for sure a lot of potential. will you keep the curved glass screen.