Yeah, I figured that a reaper (as scythes are traditionally used to harvest plants) would be appropriate. I mixed the nobility positions up a bit to make the pikmin civilization feel unique in itself. They were mostly superficial, except I combined book keeper, trader, and some other similar position (basically the three office worker positions) into one and then made it so you could have three of them per fort. Somewhere along the line I decided Pikmin dislike bureaucracy.
Alright, that definitely crossed my mind and it makes sense to me.
However, I had a problem with my first fort where the Pikmin refuse to eat anything, and once hungry stopped working.
I looked at the raws, and noticed that you set them to hunt vermin. Curious as to whether this caused them not to eat normal food, I removed that tag, and they've been working fine since.
My second fort I decided to attempt to build above ground. At one point I bum-rushed a dwarf orange bulborb, and good gosh it felt good to do so, even with a few Pikmin body parts flying around.
Later a Puffy Blowhog showed up and ruined my day as I had only one blowgunner and he was slammed into a tree almost right away, allowing it to go on a rampage and (slowly) kill all but two, who went insane.
Between the Yellow Wollywogs, Unmarked Spectralids, various dwarf bulbob groups and the occasional firey or puffy blowhog, this mod does a really, really good job at feeling like the Pikmin environment. The trees you've said you're working on, so that should be even better, although when it comes to base mechanics and what to build, I'm not sure where you would go with that. I'm sure making a fort with five different partitions will probably be a popular idea.
Lastly, I'm very used to the standard DF tileset, and am unfamiliar with graphic sets. I tried using init to not use graphics, but for some reason all the colors got messed up when I did so. Could anyone let me know if there is an easy way to, say, set a few options to change it back or are the raw settings causing this and it would be a pain to change?