I plan to put folk nylon strings on a parlour guitar. Why? Corvid-19 lockdown of course. The guitar is my Ibanez Artwood AVN3-NT Parlour.
so 1st things first. string size comparison
Steel .054 .043 .032 .025 .016 .012
Nylon .045 .037 .031 .040 .032 .028
We knew the trebles were thicker, but did not realize the basses were THINNER.
Ideally, starting with a blank nut would be preferred, so all slots could be cut to fit properly but we do have a precut bone nut on hand so we will make do. If this works out, we will advance to cutting a nut from scratch. The plan is to leave the bass strings slots alone and to widen the treble string slots.
I am waiting on some cheap nut slot dressing files.
Other considerations. We have no fear of tension, because nylon has so much less than steel. However the bracing is designed for steel strings, not nylon. It may result in muted output. But we are going for FOLK not Classical.
RobertW, I don't think the sound will be muted in any way. I think it will just be different and put out less volume. Simply because the lesser tension and the different string material won't be able to physically drive the sound board like steel strings.
But you don't need loud, you just want a cool sound and it should probably be just that.
===================================== One Alvarez in the hand is worth two Taylors and a Martin in the guitar store!