looking forward to see finished!!
I've made ARMO 1/72 Sumida Type 91 some years ago, struggle for rivetting at that time. :-<
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and answer your questions,
--> Soft borders, IJA late 3 color camo painted with spray
--> base color is Karekusa-iro (Parched grass)
--> correct mix for Tamyia acrilics that followed Tamiya Ho-Ni instruction,
http://www.1999.co.jp/image/10015441t/60/1
Karekusa-iro (Parched grass) ; 2:1 mix of XF-59 and XF-64
Tochi-iro (Earth) ; 2:1 mix of XF-10 and XF-7
Kusa-iro (Grass green) ; XF-61
This is a subjective opinion, I feel necessity somewhat arrange from this recipe.
Regards.