Simple Conversions

I'd have to change strings
 twice
in one week?

I was tempted to change my Ami to a classical (I have a set of nylon ball-end strings,) and the Ami just feels like a classical. I was recommended not to try it, the top would not vibrate enough with nylon strings, but I am still tempted to try it the next time I need to change strings.

umm
I wonder if a whole class of guitars disappeared.

Back in the day many people played what we called a Folk Nylon guitar. The string makers called strings for them, Folk Nylon. I assume that was what my Espana was. I played Folk music on it
I also assume they had narrower nuts than 2". Could be the same as what is called a hybrid these days?

I used the following strings on it. And I still have a set. You CAN use ball end in classical bridge btw  

www.daddario.com/DADProductDetail.Page?ActiveID=3769&productid=237&productname=EJ32_Folk_Nylon__Ball_End__Silver_Wound_Black_Nylon_Trebles

the high e is .028  low e is .045
maybe I'll have some use for that bone nut I got for free. If I can remember what corner I tossed it in..

Actually I have no idea how wide the nut was. Keep in mind I had 2 Espanas, the 12 and the classical; they could have had the same nut size

and what about tension?

Most guitars built for steel strings are either X braced or ladder braced, while those built for nylon strings are usually fan braced. Nylon strings would probably not drive the top of a guitar with ladder or X bracing enough to give you any volume. 
Here is a page from the 1965 Goya catalog where Oscar Brand tell how he helped Levin design the "Folk Guitar".

Surprisingly @sleigh, I didn't even notice that the photo had been flipped.

@sleigh, It's ok to be OCD as long as you are consistent.