These are the grain pedestals https://martinlishman.com/grain-pedestals/?gclid=EAIaIQobChMIzp2yyIu...

They will stand up on their own ok without the fans on them, but we will tip some grain around them to hold them in place when we tip the first load against them. We had a lot of trouble with them moving this year because the grain was so dry it was running like water and literally washing the pedestals away. They have a circumference that they will effectively draw from.

We store all wheat and barley under 15% and the temperature it goes in at if it's not been dried is what ever the ambient temperature is, which might get a little over 30 degrees C at the highest. When you cool the heap, you have to pick your day because you can end up drawing moisture in. There are automatic system available that only cut in at your preferred ambient temperature and humidity. A friend of mine has them and says they might only work for an hour or two at certain times of the day, but it is very effective. Hopefully those times are at night with off peak electricity.

People have put lateral systems in on the floor, but they are an absolute nightmare to unload the store with a loader because you always hit them. You'd have them connected to a tunnel that runs down one side with a fan.

The other option is under floor ventilation. Our building is a standard kit that has had load bearing grain walling added to the specification and a normal but polished floor. With under floor ventilation, you have ducting under the floor, hard wood slats between the wood that you can drive on. The air would be forced down a tunnel and through the floor ducting with slides to shut off sections. You can apply heat to the incoming air, but you tend to force the moisture to the top of the stack, so what people are doing to get a better, more even dry, is to install stirrers. There are vertical augers that are suspended on a gantry that stir the grain to keep it mixed which stops under and over drying in the same heap. The augers will move along the length of the store on their gantry https://www.pellcroft.com/grain-stirrers/ https://www.spanwright.co.uk/product/ventilated-concrete-drying-floo...

I'm probably telling you things you already know, but you very much need to manage the store. We took our eye off the ball this year and kept some of the previous years barley they got weevil in it even though we had the bins cleans and sprayed. We're checking temperatures and checking for insect regularly. The heap is pushed up level when we load it and the the top rakes level so there are no high points in it.

It very tempting to use it as a dual purpose building, but we get terrible problems with mice is we leave anything there that they can hide under. Once you get them in there it really is a job to keep them out, even in subsequent years because they follow their scent trails.

Our building can be used for other things because of the polished floor and it is a very strong building, so we could easily rent it out for $10/sq ft and not bother with grain.

If you have any more questions do ask, I'll try and answer them and or send a few links.