Tips on dimensions, what is too big?

Hi all, so I am trying to figure out which logs to use for my small house, and what I shoud start cutting into materials.

Im having a hard time to visualize if some of my logs will be too big, or just look awesome!
Log sizes is about 20-24"
Its not gonna be higher than roughly 10ft or so, and the room will likely be around 5-600sqft.

Any hints and tips will be helpful, before I start cutting!

One thing we need to know to answer that well is your climate. How cold does it get, and for how long?

Unless you are in the far north where every bit of insulation is critical, I would think logs of that size would be better split in half so you can have flattish interior walls and less mass to move around in building.

Thanks for replying

I'm about 60° N in Sweden.  It gets cold, so I need to insulate above the logs, I want them visible, or at least some of them.

I'm not good at visualising this stuff, so any input is useful. Looked at a lot of pictures, but hey...still confused.

It's more of the look in this stage. If I use the big logs I will also use them for maximum span in the room, so they will serve a purpose.

In that case, I can see the point to really thick logs, presumably softwood that is light and will not conduct heat that fast. Using the logs whole would let you cover/fill say half of the interior face with insulation, so you have part insulated plastered (or whatever) wall and part impressive rounded log surface so thick that it is pretty well insulating.

You need to decide whether the reduction of cutting and finishing balances the extra effort of moving the big logs and the additional roof and foundation you need to make a building with them, and the relative expense of insulation of a thinner structure compared with the smaller amount of structural material you would need for that.

I expect that space for building is not an issue, only the amount of building you would have to do for various methods.