Rico Loma

This is probably more work up front to save you time in the long run...
Could you reposition the array for easy access?  You mentioned it is a  small size

Your time has been well spent Luka, you have a gorgeous abode.  Respect!

Croatia is such a fabulous country with a vibrant culture. I had a long summer on the islands around Korçula decades ago, and the beauty is still etched in my mind, the inland areas are also amazing

I want to dovetail with comments from Cristobal
Camping has been in my blood since the age of diapers and sippy cups.  But living a couple of years in an RV was not for me, even as a college hippy. They are predominantly made of rubber and plastic,many are magnets for mice and mold.  Please make that your last choice.  I spent a year in a simple greenhouse that, with good ventilation and shade cloth, was far superior for my health and my wallet.  Although I did wake up once to a curious rattlesnake nearby...

Best of luck to you, the islands of Greece are quite magical with stellar kayaking opportunities

I am pretty sure NM is New Mexico,  so usa

Also, did you use a paint gun, or another way to paint the barrels?

It's good to have your perspectives,  thank you. One query about your paint, Benjamin, are you using a specific brand? I read a bit about that type,  and assume you chose a Cerokote style as it's rated to 1800 F?

Les, that is a brilliant idea ,thanks. It would stand to reason that every home has a kitchen drawer with two old Android phones gathering dust, seems like a great way to upcycle them.  

Truly great discussion,  makes me engage with further research

Thank you both for the help, as usual my math was off base. And RScott, you are right on target about relative pricing.  Also good, Cristobal, to realize the mechanics involved mean a great deal to finished product, eg, air pockets and R value in an expedient concrete mixer.

I apologize to anyone I have offended by posting my opinions,  that was not my intent.  Somehow I can no longer upvote replies by others, sorry for my replies that are unworthy or wrong, I have zero social media experience so please accept my apologies.  Simply trying my best to follow the rules, folks
Rico

This idea is fascinating to me on many levels. Yet more questions remain, perhaps more than answers, indeed.
Portland 94 lb bag costs about 20 clams for me, hurting my wallet as much as the shoulder I use to carry the damn thing.  It is nice to have options by buying this, adjusting ratios to sand in myriad circumstances.  So the number posted here must estimate the amount used for a block, I am guessing. So is that about 9 blocks crafted per bag of Portland? The total price per aircrete block still seems cost prohibitive

But the basic idea, adding insulation via air pockets in a block, is an important advance.  How best can this be achieved?
This is another example of my basic incredulity about our capitalist system, which proclaims to have open competition....but then how do we square the idea that a project I buy block for in the EU has amazing choice available for block? And the USA has very little affordable choice ,ready made ,for the exact same project?  Those insulating clay based block in Europe are amazing to use, effective and affordable, full stop.  And if one percent of the red clay in GA was dug up, I bet we could have the same product for sale here.
Could anyone share their experience on this topic? I hear William  , and have a hard time comprehending "how we got here"