Sorry for the double post there, - yesterday when I clicked on "Post" my browser crashed and I didn't realized it had posted so typed the whole message again, amazing how the messages are so different though, shows how we are not computers hehe, you just can't write the same thing exactly twice, eventhough you know you want to talk about
Anyway your oven looks totally fine ! , hey as long as it works, why replace it ! - if the thing is heating propery that's the thing that counts.
Living in Canada, I can't get tiles from your source, but will check at HomeDepot.... those tiles almost look like kitchen tiles ? or bathroom tiles ? .... seems you just turned them upside down..... not sure..... is the other side of your tiles glazed ? and do they have some sort or pattern on them perhaps ?
anyway interesting stuff, I'm going to check around for sure.
Thanks for the tip Steve