#1 I remember well, that you said that everything we experience through indriya comes under Rūpa. So, I remember it that way. All this indriya used for kamma viññāṇa would be of course salayatana. Giving samphassa.
#2
Mind made viññana = kammā viññana
Mind made vēdanā = samphassa-jā-vēdanā
Mind made saññā = (?) I don’t know.
Again guess would be that mind made saññā is saññā experienced due to saṅkhāra done under effect of kammā viññana.
#3 If I am not wrong Saññā and vēdanā are cetasika arising with all the cittā or citta vitthi.