I am building a bed for my Son and DIL. Sort of Arts and Crafts style. Has a row of vertical slats about an inch wide and spaced about an inch. About 36 of them.
How to attach them?
I could cut a slot and then put a spacer between them.
With the equipment I presently have I'd select slot and spacers as the easy way and mortises as the hard way (I don't have a vertical mortiser and would use my horizontal but it makes rounded ends which would need chiseling). I don't have a Domino machine and I don't know how thin your slats are but I'd be a bit concerned about cutting endgrain into thin wood on general principles.