I'd like to suggestion for the following blueprints:
Small Well/Fountain, for easy watering can refilling
Crop Field/Animal Pen, creates a flatten space surrounded by fences ready for planting or keeping animals. Could come in multiple sizes
Supply Shed, creates a storage area for materials, optional integration with Storage Drawers(would replace chests)

tried to stick with things that are from the HM games that weren't already in the plans

Sounds like things that would fit in the the second major update (0.7). Where the are focused on a bunch of new buildings, mainly for your farm.

Related to this, the barn is way too small. It could use a size upgrade since 1 cow barely fits inside.

There is no barn... There's an Animal Ranch which is a store...

That's literally on the plans.

But it gives you a cow and has two little stalls. If its not a barn, there should be a barn blueprint

Oh, whoops

I would love to see "player homes" at some stage, I'm not the best builder in the world, Yulif puts me to shame