I agree that whoever devised the script, based it largely on the Latin one. The Voynich r is "r rotunda", which is a normal way of writing /r/.
The bench glyphs are ligatures of a combination of /k/, /r/, /t/ and/or a vowel. I think there may be subtle variations allowing the trained eye to see which sound is meant, but for me it's often the most annoying glyph to interpret. It becomes easier if you can read the surrounding glyphs though.
I'm not 100% sure yet about Voynich y. It may function as you say in some cases, but for now I read it as an "a with flourish". So just a fancy way of writing a. (this is clearer in the MS than in EVA). An indication for this is that Voynich a rarely appears at the end of words.
The bench glyphs are ligatures of a combination of /k/, /r/, /t/ and/or a vowel. I think there may be subtle variations allowing the trained eye to see which sound is meant, but for me it's often the most annoying glyph to interpret. It becomes easier if you can read the surrounding glyphs though.
I'm not 100% sure yet about Voynich y. It may function as you say in some cases, but for now I read it as an "a with flourish". So just a fancy way of writing a. (this is clearer in the MS than in EVA). An indication for this is that Voynich a rarely appears at the end of words.