Deanna,
Argh! You have my dream loom! lol I've been hunting high and low for a 40" 16H Macomber. I did buy a 32" 12H that I've just recently finished refurbishing. Haven't gotten it from the garage and ustairs yet. I'm really excited to get it warped.
If you know of or see another 40" 16H for sale, let me know, please! (even if it is less harnesses but able to add up to 16 like you did.)