TPBO

[FCIN]

Those kind of industry requiring some kind of loading/unloading/storage facilities for stuff transported in covered hoppers is quite common to find. The problem is the level of detail required to have a nice model is quite high. The piping, platforms, ladders, handrails etc. are quite complicated. In Vernon is a nice bakery. A "shoebox building" but they have external unloading and storage facilities for flour. From model point of view similar to Mill & Feed Fertilizer.
I did search plastic kits that could be used as a good starting point for kit bashing. The "standard" Walthers grain elevators are of little use for that purpose.

Walther's grain and feed bins along with those made by Rix Products can work quite well to model grain elevators and feed mills, Although you might have to reduce the height of some of them - the feed mill surge bins, being a one example.

Here are some photos of a small grain elevator that I threw together about 10 years ago using Rix Products bins, piping and grain leg along with a Walther's drier.            
Never did finish it completely and have no use for it now, although I might salvage a couple of the bins for use on a new structure if they'll look right. There are a lot more finely detailed parts available these days were I going to build another one; metal ladders and cages, better looking grain leg, etc. But this one captured the look of the prototype I based in on and was all that was available to work with at the time.

I sure know what you mean about not wanting to spend $100 or more for plastic kits to kit-bash or even to use as is. I literally get sick when I see the prices that Walther's and some other companies are charging for plastic kits with moderate detail and often warped parts that won't fit together properly without a lot of work. But if you need grain bins, that's about the only way to go, but again, the prices have jumped considerably compared to what they were a few years ago. The model in my photos cost me about $80 10 years ago and that was a lot of greenbacks to spend for one model!